The Uses and Gratifications Theory posits that people actively seek out media to satisfy certain needs. It focuses on why people use media rather than what media does to people. The theory assumes people are not passive media consumers, but rather actively choose media to fulfill needs like diversion, relationships, personal identity, and surveillance. Modern research has applied the theory to understand motivations for using mobile phones and text messaging. The theory identifies four basic human needs that drive media use: diversion, relationships, personal identity, and surveillance.