Everybody want to protect their own computer. At first we discuss, what is "Virus". A virus is a small program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. A simple virus that can make a copy of itself over through a attachment via e-mail or in a download file or through internet. Such type of a virus capable of transmitting itself across networks and bypassing security systems.

   To protect computer from such type of small but very dangerous virus, there are so many "Anti Virus Software"s in the market, like - AVG, Norton, MacAfee etc. Anti-virus is also a one type of software which protect various types of viruses and heal them. It scan the computer regularly and search any kind of virus and either heal them or remove them from the computer. Thus an anti-virus helps to protect computer.