This is a genre of anime which features mechanical fighting machines. Often these take the form of giant robots but this isn't the only form mecha can take. There are tons of examples of mecha titles considering the popularity of the series. Blue Gender, Shin Seiki Evangelion, Tenkuu no Escaflowne, and Bubblegum Crisis Tokyo 2040 are all classic mecha titles.
A sub-genre of science fiction dealing with future urban societies dominated by computer technology. Baburugamu Kuraishisu, Serial Experiments Lain and Koukaku Kidoutai are good examples.
