Off break - Right-handed with finger spin technique. (e.g. Muttiah Muralitharan)
Left-arm orthodox spin - Left-handed with finger spin technique. (e.g. Daniel Vettori)
Leg break - Right-handed with wrist spin technique. (e.g. Shane Warne)
Left-arm unorthodox spin - Left-handed with wrist spin technique. (e.g. Brad Hogg)
Depending on technique, a spin bowler uses either predominant wrist or finger motion to impart spin to the ball around a horizontal axis that is at an oblique angle to the length of the pitch. This sort of spin means it is also possible for the Magnus effect to cause the ball to deviate sideways through the air, before it bounces. Such deviation is called drift. The combination of drift and spin can make the ball's trajectory complex, with a change of direction at the bounce.
This variety of trajectories achievable by a spin bowler can bewilder inexperienced or poor batsmen.
Spin bowlers are generally given the task of bowling with an old, worn cricket ball. A new cricket ball better suits the techniques of fast bowling than spin bowling, while a worn one grips the pitch better and achieves greater spin. Spin bowlers are also more effective later in a game, as the pitch dries up and begins to crack and crumble. This again provides more purchase for the spinning ball and produces greater deviation.