The tracking shot can be combined with other movements. If there is a crane mounted on the dolly, the camera can rise or fall while tracking. The camera can zoom and dolly at the same time. There are cases where an operator carrying a camera is dollied for part of the shot and then smoothly dismounts to continue the movement while walking.
Some famous examples of tracking shots include Danny's point of view shots in Stanley Kubrick's The Shining, when wheeling around the Overlook Hotel; and the shot in the restaurant introducing several characters in Goodfellas? ("And then there was Jimmy Two Times, who got that nickname because he said everything twice, like: I'm gonna go get the papers, get the papers.")