  Young pulsars spin incredibly quickly, but are also slowing down at a very
rapid rate. This process carries away enormous amounts of energy from the star
in the form of a relativistic wind. Through the high resolution now offered by
the Chandra X-ray Observatory, a flood of new observations of pulsars and their
winds is demonstrating the diversity and complexity with which pulsars interact
with their surroundings. This paper reviews our basic understanding of pulsar
winds, and briefly summarizes some of the new insights provided by Chandra on
shock structure, particle acceleration and wind composition.
