This video shows your three basic pool strokes. These different strokes are used to position the cue ball at a desired location on the table after taking a shot, usually to gain optimum positioning for the next shot.
First is follow, where the cue tip contacts the cue ball above center. This puts a forward spin on the cue and causes it to "follow" the object ball.
The second shot is called the stop shot. The cue tip hits the cue at its center, imparting no spin on the cue ball at all, causing it to "stop" right where it is as it hits the object ball.
The third shot is called the draw shot. The cue tip contacts the cue ball below center, causing a reverse spin on the cue ball, which "draws" the cue ball back towards the shooter.