Microscopic infectious agent of DNA or RNA needing host cells.

• Can cause disease in animals, plants, or bacteria.

Malicious program that replicates itself and spreads between computers.

• Often damages systems, data, or performance.

Something harmful that spreads quickly through a group or society.

• A contagious idea, rumor, or influence.

To infect a computer or device with a virus.

• To send malware that replicates on a target system.