Teknivals are large free parties which take place for several days. They take place most often in Europe and are often illegal under various national or regional laws. They vary in size from dozens to thousands of people, depending on factors such as accessibility, reputation, weather, and law enforcement. The parties often take place in venues far away from residential areas such as squatted warehouses, empty military bases, beaches, forests or fields. The teknival phenomenon is a grassroots movement which has grown out of the rave, punk, reggae sound system and UK traveller scenes and spawned an entire subculture. Summer is the usual season for teknivals.

Free tekno, also known as tekno, freetekno and hardtek, is the music predominantly played at free parties in Europe. The spelling tekno is deliberately used to differentiate the musical style from techno. The music is fast and it can vary between 150 and 185 bpm and is characterised by a pounding repetitive kick drum. Nevertheless, bass drum distortion by clipping is used less often as in the related genre of mainstyle hardcore. Nowadays, some tekno producers also use drum sets that rather sound trancey, since many members of the tekno subculture as well as the psytrance subculture frequently attend the same raves and the two scenes are closely connected.