SQL recovery models

You should use the full recovery model when you require point-in-time recovery of your database.

You should use simple recovery model when you don’t need point-in-time recovery of your database, and when the last full or differential backup is sufficient as a recovery point.

Recovery Models (SQL Server)

http://msdn.microsoft.com/en-us/library/ms189275.aspx

Choosing the Recovery Model for a Database

http://technet.microsoft.com/en-us/library/ms175987(v=sql.105).aspx

SQL recovery models