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In recent years the census of known satellites in our own Local Group and innearby galaxy groups has increased substantially due to sensitive wide-areasurveys. In the Local Group these surveys have more than doubled its knowngalaxy content and extended the galaxy luminosity function to very faint totalmagnitudes. Deep ground-based imaging and spectroscopic observations as well ashigh-resolution imaging with the Hubble Space Telescope have revolutionized ourunderstanding of the chemical evolution and star formation histories of thesatellites. We often find long-lasting star formation episodes with low starformation efficiencies. There is evidence for localized, stochastic enrichment,and recent searches are now beginning to uncover even extremely metal-deficientstars. In many satellites evidence for two or more distinct stellarsubpopulations is found. Differing fractions of old populations have beendetected in all satellites studied in sufficient detail so far. Kinematicmeasurements support a picture in which satellites are dark-matter dominated,although recent results indicate that the proposed common mass scale for dwarfspheroidal galaxies may not hold for very low-mass satellites. When consideringsatellite ensembles, we find global morphology-distance and gas-content -distance relations in all groups studied thus far, but individual starformation histories also strongly depend on a given satellite's intrinsicproperties.

Satellites in the Local Group and Other Nearby Groups