Poker tournaments are normal tournaments where the prize is entry into a high level event or a big cash tournament. Satellites are a great way for newer players to try and qualify through to bigger events and they are beneficial for a number of reasons.
Firstly, they are good to play because they are cheap. These poker satellite tournaments quite often have very small buy-in fees which makes them accessible to new players. This means you can start at the base level satellite event and work your way through to a main event where the buy-in could be hundreds of dollars.