Instructive (adjective)

1. Serving to instruct or teach.
2. Providing valuable information or learning.

Origin:

Late middle english (in the sense "giving instruction"): from latin instructivus, from instruct- "taught", from the verb instruere.

Examples:

1. The book was both entertaining and instructive.
2. His talk was very instructive, I learned a lot from it.
3. The movie was not only entertaining but also instructive.
4. The museum exhibit was very instructive, with detailed information about the history of the area.
5. The teacher gave an instructive lecture on the causes of the war.