Macro virus

A MAC or Macro virus is a computer virus that spreads to other computers through software programs that utilize macros. For example, Microsoft Word and Microsoft Excel are two popular and widely used programs that are capable of executing macros. Macro viruses written for these programs can spread by infecting other related documents each time the document is open. Because these files are commonly used and sent through e-mail, a computer network can be quickly infected by these viruses.

Also see: Macro, Security terms, Virus