Defunct (no longer in use or active) may refer to:
* ''Defunct'' (video game)
* Zombie process
or defunct process, in Unix-like operating systems
* :Former entities
* End-of-life product
Obsolescence is the state of being which occurs when an object, service, or practice is no longer maintained or required even though it may still be in good working order. It usually happens when something that is more efficient or less risky r ...