Information security. Author. What is information security? Information security, sometimes shortened to InfoSec. Computer system threats. Theft of intellectual. Antivirus program. Antivirus - a computer program designed to detect and decontaminate computer viruses. Virus. The virus - itself capable of distributing a computer program. Viruses types. Link viruses Macro viruses Parasitic viruses. The most popular anti-virus program. AVG Avast Avira AntiVIR Norton Antivirus Kaspersky antivirus. Information security is important thing for each information system.