Maslow's hierarchy of needs is a five-tier model that categorizes basic human needs into deficiency and growth needs. Deficiency needs include physiological needs, safety, love and belonging, and esteem. Growth needs refer to self-actualization. There are three theories of audiences: passive audiences who consume media, active audiences who make choices, and interactive audiences influenced by new media. The hypodermic needle model views audiences as passive and vulnerable to direct media messaging. Cultivation theory suggests television shapes viewers' worldviews over time, with heavy viewers more susceptible to influence. The two-step flow theory and uses and gratifications model view audiences as more active in selecting media to fulfill needs.