Video on demand (display) (VOD) are systems, which allow users to select and watch/listen to video or audio content such as movies and TV shows when they choose to, rather than having to watch at a specific broadcast time, which was the prevalent approach with over-the-air broadcasting during much of the 20th century.
See also: VOD.
This term is used in software engineering, programming, scripting, testing, application architecture, and development lifecycle work. It helps teams describe how software is designed, implemented, integrated, and maintained.