•Virus detection software, also called antivirus software, regularly
scans the files on your computer and files being downloaded to your computer.
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•Files are compared to a signature that
known viruses carry.
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•A virus signature (also called a virus pattern or a virus definition) is a
sequence (string) of characters that is always present in a particular virus.
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•When the virus detection program finds a virus signature, it warns
you. You can either delete the file or ask the virus detection program to remove the virus.