Games Workshop Group PLC (often abbreviated as GW) is a British miniature wargaming manufacturing company. Games Workshop is best known as developer and publisher of the tabletop wargames Warhammer, Warhammer 40,000 and The Lord of the Rings Strategy Battle Game.
Very good little introduction into Warhammer 40k. Comes with a model Necron and Space Marine which it shows how to build and paint. The book is well written and easy to read and contains basic lore on all the factions, how to build and paint models, and a battle report. It's a good introduction although I wish it contained a little more on the rules of the game.