Catboats: The catboat only has a mainsail.
Boats with Two Masts:
Ketches: A ketch has two masts, the front one being taller. The smaller mast is called the mizzen. To be a ketch, the mizzenmast must be in front of the rudderpost.
Yawls: The yawl rig is very similar to the ketch rig and is usually seen only on older boats. The yawl’s mizzenmast is usually smaller in height than the ketch.
Schooner: The schooner is a very traditional rig with two or more masts. The front mast must be shorter than the main mast.
