The joint on the outboard end of the tie rod - this is the piece that actually physically attaches to the steering knuckle. This is usually just a standard joint, nothing too fancy.

The usual maintainance procedure for a tie rod end involves using a grease gun to pack grease into it(the tie rod end) through a special fitting called a grease zurt - which is, in fact, what most mechanic-type establishments refer to as a chassis lube. It's also customary to inspect the seals when performing this procedure.