en·cy·clo·pe·di·a
en·cy·clo·pe·di·a/inˌsīkləˈpēdēə,enˌsīkləˈpēdēə/
noun
a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically.
"if you're not familiar with a concept or topic, consult an encyclopedia"