How computer viruses work?

There are different types viruses and they work differently. Such as Viruses: They are program codes that attach itself to certain programs and when the programs runs they also run and starts damaging. Email virus: They are viruses that send itself as email attachments and even launches without clicking. read more

Viruses: A virus is a small piece of software that piggybacks on real programs. For example, a virus might attach itself to a program such as a spreadsheet program. Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce (by attaching to other programs) or wreak havoc. read more