What is Antivirus and its types (2021)

Antivirus This is a program (code). You can also say that this is such a software that finds all the hidden virus programs in the computer and deletes it from the computer. It can also be said that it acts like a Safeguard for the computer, which protects against malware like Computer Worms, Trojan Horse.

Antivirus also protects the computer from Spyware and Adware. Detect and delete all these programs from your computer. Something shortens your files, makes files disappear, which slows down the computer.

I mean to say, this is a good software removes all those programs which are harmful for your computer. Now you are wondering whether a program is a virus, yes a virus is also a program. Only one person is the creator of these two. Example:- Avira, Avast, AVG Kaspersky. So now let’s know how this works.

How antivirus software works in computer-

First of all let’s explain it in simple language. I would like to explain its work in simple language as everyone can understand. Antivirus already contains Signature or Virus Definition Files of many Viruses.

These are all Robust files, these files contain a list of malware (Computer Virus) and their related information. To understand this, Virus Definition has to be understood.

Virus Definition-

Antivirus cannot identify/identify malware without virus definition. That’s why Virus Definition has to be updated. Because Virus Signature resides inside Malware Defination. The names of the malware that are already in the Internet and their related information are kept in this definition.

Whenever a file is infected with malware or if any malware is detected during the scan, then Antivirus first checks whether it is similar with Virus definition or not. Virus definition Some malware properties and programs like that remain. Therefore it is also necessary that the Antivirus company should always update the Virus Definition.

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First of all, this software scans all the files present inside the computers. Whenever a file matches with Signature or Virus Definition Files. At the same time it repairs or deletes that file.

By the way, whatever action you take, that works only on that. When the computer virus program enters the computer, it starts working with the computer files upside down.

How Antivirus Detects Malware-

The most difficult thing is that there is 500-1000 GB of DATA in the whole system. And to find the virus out of it, then let us know in what ways it detects it.

Signature-based detection-

This is one of the oldest way, to find out computer virus. In which all the .exe files in the computer have to be matched with Virus Definition Files or matched with other malware types. Whenever an unknown file is recognized, then action is taken on it.

In this Signature based technique all the programs are scanned. If any application is downloaded in this technique, then the software is first scanned. After that it is installed. That’s why it is advised that whenever you download any software, then scan it beforehand.

Because once your system gets infected, it becomes difficult to remove it.

Heuristic-based detection-

This technique is used together with Signature based detection. Heuristic technique is used in all the antivirus of today. Even if there is no virus definition file, with the help of this technology, new and old Virus can easily be found and removed.

In heuristic, it runs a suspicious code or application in a virtual environment and it knows which program is trying to effect this application.

Data Mining Techniques-

This is the latest trending technology of today’s time. In which there are features of some special programs. It is ascertained whether the program is malicious or not by the data mining technique.

Features Of Antivirus-

Background Scanning
Full System Scans

Background Scanning-

Even when you keep doing some files, applications and online in the system, it keeps scanning all your files. This is called Background Scanning. This gives your computer Real Time Protection and Safeguard. No malware can attack on your system.

Even when you keep doing some files, applications and online in the system, it keeps scanning all your files. This is called Background Scanning. This gives your computer Real Time Protection and Safeguard. No malware can attack on your system.

Full System Scans-

By the way, the need to do a full scan is not so much. If you are installing a new Antivirus in your system for the first time, then you need to do a full scan once. This will remove all the hidden computer malware in your system means computer.

After this, the background scan continues automatically. And in between, your laptop should be fully scanned.

Best Antivirus for 2021 and get antiviruskey through


I have not used all the Antivirus but there are some Antivirus here . which you can buy activation keys for 1 or 3 year from

  1. Bitdefender Antivirus-
  2. AVG antivirus-
  3. Quick heal antivirus-
  4. kaspersky –
  5. k7-
  6. Mcafee –
  7. Net protector-
  8. Guardian-
  9. Escan-
  10. Eset Nod-

Benefits of having Antivirus in Computer-

Yes, in the present times, so much malware attack is happening in the Internet. Therefore, you must use either the free one or the paid one.

  • First of all, it keeps all your data safe.
  • No one can steal your data from the Internet from the computer.
  • Before any computer virus damages your computer, it does its own thing on it.
  • If you buy antiviruskey, then all your online transactions will also be safe.
  • This will save you money because with the money that malware will damage, you will buy two or three Antivirus.
  • Your System Will Never Hang or Slow
  • System Software and Application Software will run very smooth.
  • Processing speed will increase and there will never be a system crash.
  • The chances of getting Hard Disk Corrupt is also less.

conclusion –

Buy good software. Because Malware attack is happening very much at this time. Therefore, buy Multi User Antiviruskey by paying money which will be a little cheaper. I told you what is antivirus What is Antivirus and how it works.

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