plays techno is called a techno DJ, and so on.

The quality of a DJ performance (often called a DJ mix or DJ set) consists of two main features: technical skills, or how well the DJ can operate the equipment and produce smooth transitions between two or more recordings and a playlist; and the ability of a DJ to select the most suitable recordings, also known as "reading the crowd". One key technique used for seamlessly transitioning from one song to another is beatmatching.