Evergreen Content
noun
A type of content found on the internet that is always up-to-date for users. This content comes in two sub-varieties. Those that are updated on a fairly frequent basis, and those that never need updated.

“The agency made a list of all local pizza establishments and makes sure it stays updated.”

“Most of IMDB’s content is evergreen because it is facts based on real events in entertainment.”

“A definition is evergreen content”