Overwrite

1. A term used to describe when new information or data replaces old information or data.
2. One of two typing settings on a keyboard, overwrite mode allows new input to replace existing characters. The Insert keyboard key is commonly used to toggle this mode, enabling or disabling it.
3. When referring to a virus, an overwrite virus is a type of computer virus that overwrites a file with its own code, helping spread the virus to other files and computers.

Also see: Insert, Overtype, Security definitions, Virus