How are computer viruses made?

A computer virus is a type of malicious software program ("malware") that, when executed, replicates itself by modifying other computer programs and inserting its own code. When this replication succeeds, the affected areas are then said to be "infected" with a computer virus. read more

Computer virus infections can lead to entire systems failure, wastage of computer resources and increased maintenance costs. Examples of computer viruses include worms, Trojan horses and logic bombs. While some viruses are intended to cause harm, others are used as pranks and are not intended to cause harm. 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