What is a computer virus? How to protect Computer from Viruses?

Friends, we all know about computers. Because the importance of computers in our life has increased so much that we can call this age the computer age.


What is a computer virus
What is a computer virus?

Knowledge of computers is required for a good job in today’s age.

We all know how to use a computer, but do you know about a computer virus? What is a computer virus and what are its side effects?


Because viruses are very harmful to computers, mobiles, electronic gadgets. Because once a virus enters your computer, it can do a lot of damage to your computer system.

Your computer system starts working very slowly due to the arrival of computer virus in your computer.

In addition, computer viruses destroy your computer system and data.

Today we are going to discuss in detail all the information related to a computer virus in this article.

For example – what is a computer virus? What can a computer virus do? What are the types of computer viruses? Symptoms of virus infection in a computer system, What is the way to avoid a computer virus?

What is a computer virus?

Friends, a computer virus is a type of software program designed to reduce the performance of your computer as well as to prevent the software on your computer system from working and destroying the data of the computer.

The full form of the word VIRUS is Vital Information Resources Under Siege.

Friends, we all know that computers have many software programs and the computer fulfills the tasks given to us through those software programs.

Computers can do nothing without software programs. This computer virus can enter your computer system in many ways without your permission.

And most importantly, users often don’t know about it. This virus spreads slowly on your computer.

If your computer system is more affected by viruses, it also hangs.

For your information, I would also say that the virus is not natural. It was created by hackers.

Viruses are created in the same way that multiple software programs are created to make a computer work better, but not to help but to harm the computer.

How many types of computer viruses?

Friends, I hope you now understand what a computer virus is.

But for good computer performance and security you need to know what are the types of computer viruses and how do they get into your computer?

And how much and how can these viruses affect your computer? So let’s find out in detail how many types of computer viruses are there?

There are many types of computer viruses, some of which are listed below: –

  1. Boot Sector Virus
  2. File Infector Virus
  3. Micro Virus
  4. Trojan
  5. Malware
  6. Spyware
  7. Browser Hijacker Virus
  8. Resident Virus
  9. Partition Table Virus
  10. Direct Action Virus

1. Boot Sector Virus

A boot sector virus is a computer virus that infects the hard disk of a floppy disk or the master boot record (MBR) of the boot sector.

These viruses in the system enter the computer mainly through removable media. If your computer is infected with this virus, this virus prevents your operating system from loading when you start your computer.

And your computer does not open because the operating system is not loaded. This virus is extremely difficult to remove from a computer.

In most cases, the system needs to be formatted to remove this virus from the system.

2. File Infector Virus

The number of systems infected with the file infect virus is the highest. Because a large part of the virus belongs to this category.

When a specific program is loaded, the virus loads automatically. The virus can also enter the user’s computer via email.

Some file infectors are attached to virus program files, such as .com, EXE files. This virus can be very harmful to your computer system.

This is because the virus can easily infect files or data stored on your computer.

This virus can also harm the applications on your computer. This virus can infect executable files (eg Sys, OVL, PRG, and MNU).

3. Micro Virus

Micro viruses specifically attack software and applications. Micro viruses especially damage files like Microsoft Office i.e. Word, Documents, PowerPoint, Spreadsheets.

Whenever you open the micro virus-infected software on your system, this micro virus starts its work automatically.

This affects other software or applications on your computer. The virus is spread through software or applications.

Therefore, this virus can infect any operating system (Windows, Android, macOS, iOS, etc.).

4. Trojans

This type of virus is often spread and used by hackers.

With this Trojan virus, hackers can hack into your computer via the Internet and steal personal and confidential information from your PC without your permission.

5. Malware

This type of virus is created to damage your computer. Most of the time this malware spreads to your computer system by copying files from other computers or laptops or by using an infected USB device.

6. Spyware

Spyware virus is used to monitor your computer activities and browser usage. These often enter your computer system directly from the Internet.

7. Browser Hijacker Virus

We all know how much the internet is being used nowadays. In this day and age, we like to watch movies online, play online games and visit many types of websites.

Due to which the risk of viruses entering our devices is multiplied. Some people advertise on the internet to increase their income.

Whenever you enter a URL in the browser’s address bar, browser hijackers take you to another infected website without taking you to that website.

That way, when your browser is infected with this virus, many kinds of unwanted ads will appear in your browser.

8. Resident Virus

A resident virus is a virus that carries out the transmission by storing itself in the computer’s RAM memory.

Sometimes these viruses are associated with antivirus. There are different types of resident viruses and they work in different ways.

Some of these viruses work very fast and some work very slowly.

There are also a number of problems with computer systems infected with the resident virus.

For example, being infected with this virus causes problems with any data operating, shutdown, and copy-paste on your computer system.

Recognizing this resident virus is also a bit of a challenge.

9. Direct Action Virus

Direct action viruses are also called non-resident viruses. This virus usually infects files with extensions (eg Com, EXE, etc.).

Once the virus enters your computer system, it hides in your computer’s memory.

The special thing about this virus is that these viruses do not become effective until you click on them and open them.

This virus is attached to a specific type of file. This virus can damage your system as well as your files.

However, it is reassuring that this virus is not very dangerous, it can be removed with the help of an antivirus program and it does not affect user experience and system performance.

Names of some computer viruses

So now let us tell you about some computer viruses which are very dangerous.

  • SQL Slammer.
  • Nimda
  • Blaster
  •  Code Red
  • The Morris Worm
  •  Creeper
  •  Morris Worm.
  •  Mydoom.
  • Stuxnet.
  • CryptoLocker.
  • Sasser & Netsky.
  • Anna Kournikova.

The viruses I have mentioned here are all high-powered viruses, in addition to these there are many computer viruses now and new viruses are being discovered every day.

What can a computer virus do?

Computer viruses can delete or destroy data, files, folders, documents on your computer system. A computer virus destroys the performance of your computer system.

The virus can also erase data stored on your computer’s hard disk. It can spread from one computer to another via email.

What are the symptoms of computer virus infection?

It is very important for computer users to know about the symptoms of computer viruses for better performance and protection of computers.

Because of those symptoms, you can immediately understand that your computer has been infected by a virus.

So let’s try to tell you about some of the symptoms today: –

  • Decreased performance of your computer system.
  • Automatic deletion of any file or folder.
  • Internet speeds are slow.
  • Your computer is showing unexpected ads.
  • New folders or programs are automatically installed on the computer.
  • The arrival of spam emails.
  • Error messages or warning messages will appear on your screen when using the browser.
  • Some files by themselves, the program starts automatically.
  • If your device hangs, it means that your computer system may have been infected with a virus.

So friends, if something like this happens to your computer system, then understand that your computer system may have been infected by a virus.

And it is very important to protect your computer system from this. This is because these viruses can delete or destroy the data on your computer system.

How does a virus enter a computer?

There are many sources of computer viruses, so let us know today from which source the virus comes to our computer or laptop.

  • The virus also enters by connecting one device to another.
  • If your computer system does not have antivirus software.
  • Downloading programs: Programs that contain downloadable files are the most common source of malware, such as freeware and other executable files.
  • Using pirated or cracked software.
  • Transferring files via Bluetooth can infect viruses
  • The virus can also be spread through files attached to Internet emails
  • The virus can also enter by downloading software from normal sites
  • If you open a link attached to an unknown or fraudulent email

How to prevent computer viruses?

When our computer is infected with a virus, the efficiency of the computer decreases, and the computer hangs again and again.

Due to which our work is disrupted. And to get rid of this kind of problem, we need to know how to prevent the virus.

In this part of the article, we will tell you about some ways to avoid the virus. We hope you can keep your computer safe from viruses by following our instructions.

  1. Install a very good antivirus on your computer system and keep updating it regularly. If you use more internet then you can also use premium antivirus.
  2. There is a higher risk of contracting the virus due to the overuse of the Internet. Therefore, refrain from using the Internet excessively, especially from websites that are not secure (HTTP).
  3. It is best not to visit websites that are not popular and unregistered.
  4. Stay away from bad websites. If you do not want the virus to enter your computer, never open a full-fledged website on your computer. Because porn websites contain a lot of viruses.
  5. Be sure to scan a pen drive, phone, disk, or any external device before using it on a PC.
  6. Keep scanning your computer system with antivirus from time to time.
  7. If you have no information about the sender of an email, do not open this mail. In particular, do not click on any link in the mail.
  8. Do not download anything from unauthorized websites. Such as any movie, mp3 or software or application, etc.
  9. Scan the downloaded item properly. Because the risk of the virus is much higher.

After the above discussion, the question may come to your mind that if the virus enters our computer in any way, then how can we prevent it, how can we remove it from the computer or remove it.

So let us tell you some ways in which you can get the answer to your question. Follow these steps to Delete or Remove Virus from Computer or Laptop –

Step 1: Use a trusted antivirus program.

If you already have antivirus software installed on your computer and your PC is infected with a virus while it is still running, then the antivirus software you are using is not a good antivirus. You need to use a good quality antivirus.

Step 2: Scan the full system with antivirus

First, open your antivirus software and click the scan button to start the scan.

Step 3: Remove the malware

After scanning, you will see results showing how many viruses the computer has. If you have a virus on your PC, then you will see the Delete or Remove option to remove it.

Then by clicking the Delete or Remove button, you can remove the viruses detected by the antivirus from your computer system.

Step 4: Prevent future infections

To prevent viruses from entering your computer in the future, your scan should be scheduled automatically so that your computer is auto scanned once or twice a week, thus protecting your computer from viruses.


Through today’s discussion, we learned about what computer viruses are, how computer viruses spread, how many types of viruses, how to prevent viruses.

If you like this information about computer viruses then share this article with your friends and help them to know.


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