COMPUTER VIRUS

• Computer virus are programs that spread across computers by attaching a copy of itself to the files on the infected computer.
• When the infected file is run, the virus gets into action.
• A virus is usually harmful and can corrupt data, overwrite files, or use up system resources, and slow it down in the process.
• Some may be merely disturbing like sending email using address book.
• Viruses are written by programmers to cause trouble.