  Stephan's Quintet (SQ), discovered more than 100 years ago, is the most
famous and well studied compact galaxy group. It has been observed in almost
all wavebands, with the most advanced instruments including Spitzer, GALEX,
HST, Chandra, VLA, and various large mm/submm telescopes/arrays such as the
IRAM 30m and BIMA. The rich multi-band data reveal one of the most fascinating
pictures in the universe, depicting a very complex web of interactions between
member galaxies and various constituents of the intragroup medium (IGM), which
in turn trigger some spectacular activities such as a 40 kpc large scale shock
and a strong IGM starburst. In this talk I will give a review on these
observations.
