The product is a guide to the World of Greyhawk fantasy setting AND glossography for the Role Playing Game (RPG) Dungeons & Dragons, published by TSR in 1983. It provides detailed information about the fictional world of Greyhawk, including history, geography, and character families within the Dungeons & Dragons universe. The guide is a valuable resource for players and game masters looking to immerse themselves in the World of Greyhawk and create compelling campaigns for their gaming sessions.