Radio emission has been detected from all the stages of stellar evolutionacross the HR diagram. Its presence reveals both astrophysical phenomena andstellar activity which, otherwise, would not be detectable by other means. Thedevelopment of large, sensitive interferometers has allowed us to resolve theradio structure of several stellar systems, providing insights into the masstransfer process in close binary systems. I review the main characteristics ofthe radio emission from several kinds of stars, paying special attention tothose cases where such an emission originates in relativistic jets.