I would like to present an overview of stellar jets, beginning from those
associated with the oldest stars and working back to the Class 0 Outflows.
Many advances have been made recently in the area of Protostellar Jets and
Outflows through observational studies. This leaves us with some
general constraints as well as many intriguing problems for individual objects.
The constraints on models are reviewed,
and Jet Formation and Jet Propagation models discussed.