Malware can be loosely divided into two main categories: programs that spread or cause infection and programs that conceal and hide. Programs that spread or contaminate effectively endeavor to duplicate themselves to different PCs. Their primary intention is to do directions on new targets. Malware of this sort incorporates: VirusesWorms Other malware stows away in the PC to complete its guidelines while staying away from identification. Malware that tends to conceal includes: Trojan horses Rootkits Spyware