Blumler and Katz developed uses and gratifications theory, which suggests that media users actively select media to fulfill certain needs. The four main needs are: diversion from everyday life, forming personal relationships, exploring personal identity, and staying informed about their environment. For example, reading Kerrang magazine fulfills the need for diversion by allowing readers to escape daily life and learn about rock stars, fulfills the need for surveillance by giving insights into celebrities' lives, and fulfills the need for personal relationships by keeping readers informed about new bands and releases to discuss with friends.