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Highly collimated supersonic jets are observed to emerge from a wide varietyof astrophysical objects, ranging from Active Nuclei of Galaxies (AGN's) toYoung Stellar Objects (YSOs) within our own Galaxy. Despite their differentphysical scales (in size, velocity, and amount of energy transported), theyhave strong morphological similarities. Thanks to the proximity and relativelysmall timescales, which permit direct observations of evolutionary changes, YSOjets are, perhaps, the best laboratories for cosmic jet investigation. In thislecture, the formation, structure, and evolution of the YSO jets are reviewedwith the help of observational information, MHD and purely hydrodynamicalmodeling, and numerical simulations. Possible applications of the models to AGNjets are also addressed.Comment: 19 pages, PostScript (9 figures upon request). Invited review for  proceedings of the International Conference on Plasma Physics (Foz do  Iguassu, November 1994) eds. P. Sakanaka et al

Protostellar jets: The best laboratories to investigate astrophysical jets