What is a computer virus and how do they work how anti-virus software finds them and deletes them?

Virus: A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user.

antivirus software like avg symantec mcafee etc.. are contacted by people which are infected with a virus that there antivirus programs cannot clean, they see what the virus does they clean it and then issue the virus definition updates for all the customers to download them and protect from this new virus, apart from the standard measures,

What is a computer virus and how do they work how anti-virus software finds them and deletes them?norton 360

A computer Virus is a program written by an idiot with the intention of causing damage to your computer or stealing personnel information.

Anti Virus programs search for the virus programs and remove them.

There are new virus's every day and the

makers of the anti virus programs are in constant catch up mode trying to write a program that will detect and remove the virus.

That is why you need to update your anti virus program daily.

What is a computer virus and how do they work how anti-virus software finds them and deletes them?photoshop

a virus is any number of certain kinds of files or programs that are made intentionally to harm a computer viruses have 'definitions' that an anti-virus has a database of so it can find the virus and delete it
A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. However, the term "virus" is commonly used, albeit erroneously, to refer to many different types of malware programs. The original virus may modify the copies, or the copies may modify themselves, as occurs in a metamorphic virus. A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or the Internet, or by carrying it on a removable medium such as a floppy disk, CD, or USB drive. Meanwhile viruses can spread to other computers by infecting files on a network file system or a file system that is accessed by another computer. Viruses are sometimes confused with computer worms and Trojan horses. A worm can spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a file that appears harmless. Both worms and Trojans will cause harm to computers when executed.