When it comes to the construction of furniture, there are many different types of joints that you could use.  Butt joints, pocket-hole joints, lap joints and even mitre joints are commonly used, and here are some more that you will run across:

Dowel joint—this joint is at the end of a piece of wood that is butted up against another piece, and it is reinforced with dowel pins (there are holes drilled on each side of the joint for the dowel pins to be slid into).  This joint is a very common joint when it comes to furniture that is made in a factory.

Mortise and tenon—this features a small piece of wood (called the tenon) that fits tightly into a hole that is specifically cut for it (this is called the mortise).  Not only will you find this in furniture, you will also find it in in doors, windows, and even cabinets.

Dovetail—this is a set of right-angle joints that held together by interlocking fan-shaped tenons.

This is just some of the types of joints that you will find in furniture.  What kinds of joints have you run across?