The San Andreas Fault in California is one of the more famous transform boundaries,

Transform faults occur when two boundary moves horizontally. Boundaries do not get smaller or bigger.

When the pressure between two boundaries overcome the force that keeps them together, earthquake occurs.

North Anatolian Fault is also another great example for transform fault.

San Andreas Fault (Right lateral strike slip)

North Anatolian Fault (Right lateral strike slip)

Similarity between San Andreas Fault and North Anatolian Fault

More examples other than the one in the original answer on this page: http://www.encyclopedia.com/doc/1G2-3437800619.html