Radio Control (also known as RC) is a technology used for wireless controlling of components in certain LEGO sets. In 2009 the more or less outstanding RC-technology feature became the central part of the Power Functions system.
Originally, RC was a theme introduced in 1998. It came back for 2001, but did not last to 2002. However, from 2003 as a part of Racers called RC Racers. Later some other themes were featured by RC as well.