Glossary > 

A plug-in is a feature or functionality supplied by an independent program or component. Plug-ins can be supplied by third-party vendors or independent software developers.

For example, several Video Post filter and layering plug-ins ship with 3ds Max.

The open architecture provides an API (application programming interface) designed to make it easy for other companies to write plug-ins that extend the core functionality of 3ds Max. See Plug-In Manager.