Explanation:

A macro virus is a computer virus written in the same macro language used for software programs, including Microsoft Excel or word processors such as Microsoft Word. When a macro virus infects a software application, it causes a sequence of actions to begin automatically when the application is opened. A now-classic example of a macro virus is the Melissa Virus from 1999. Opening an email containing a document infected with the virus caused the email to send itself to the first 50 addresses in the user's contact list. The virus subsequently replicated at an extraordinarily fast rate.