What is the D-list, A-list etc.?

Question

im very naive. im not that into celebrity stuff, but i still want to know

Answer 1

A- listers are well known and popular stars with films and TV shows that are high performing
B-List members are usually bit part players in some famous movies of movies that just went straight to video
The D-List really does not exist, Kathy Griffin came up with it for her show because she was not getting alot of work in movies or TV