What is The Secret World?
To answer your question, it is an MMORPG created by Funcom. It uses a subscription-optional, “buy-to-play” business model. Meaning, you can buy this game with no additional subscription fees whatsoever. Of course, it is still more advantageous to subscribe to the game.
For more info, please check out these links:
http://www.metacritic.com/game/pc/the-secret-world
http://www.funcom.com/games/tsw