An Antivirus is a software that scans your computer for Viruses. A Virus is a malicious software that enters your computer without your knowledge and performs malicious actions. A Virus spread from computer to computer through files. Viruses stay dormant in a computer until necessary conditions are met. Conditions may be opening a file or accessing the internet.
A sign of Viruses are:
The job of an Antivirus is to remove Viruses from your computer. It is important to have an Antivirus to protect your files.