Alderfer's ERG Theory is a psychological framework that categorizes human needs into three groups: Existence, Relatedness, and Growth. This theory suggests that these needs are not strictly hierarchical, as proposed by Maslow's Hierarchy of Needs, but can be pursued simultaneously. For example, individuals may seek social connections while also striving for personal development. The Existence category includes basic physical and material needs, such as food and safety. Relatedness focuses on interpersonal relationships and social connections, while Growth emphasizes personal development and self-fulfillment. Alderfer's theory highlights that individuals can move between these categories based on their circumstances and experiences.