From the back of the book:
"Dungeons and Dragons enables you to play out your wildest fantasies, to battle with monsters, giants and fiends, like the Yellow Musk Creeper of the Hound of Ill-Omen, as you search for fame and fortune in the Caves of Chaos or the shrine of the Sahodogen.
From students to solicitors, punks to professors, everyone is at it! So take our guide - written by three Etonian schoolboys who are experts in the game - and boldly plunge into the stuff of dreams - and nightmares!
Reality will never seem quite the same..."
From the introduction:
"If you already have a copy of the Basic rulebook, What Is Dungeons and Dragons? will act as a useful companion to it...if you do not possess a copy of the Basic book, this book will serve as a useful introduction to role-playing and especially Dungeons and Dragons".
A mass-market paperback for those interested in learning more about D & D and role-playing games from 1982.