add-in

Add-ins are additions to existing application programs that extend them with certain functions.

Add-ins are macros with special program functions. The term add-in is often used in combination with application and utility programs from Microsoft. For example, for add-ins from the Office package. Such add-ins are not part of the standard installation.

Such add-ins can support file export and import, convert or filter files. Add-ins are supplied by the software company but also by third parties. Under Windows, add-ins are increasingly used for Object Linking and Embedding( OLE).