Proxemics is the study of how humans use space and its effects on behavior and communication, introduced by Edward T. Hall in 1963. It includes four categories: intimate (0-2 feet), personal (2-4 feet), social (4-12 feet), and public (12-25 feet), each influencing how individuals interact depending on their comfort levels. Proxemics emphasizes the cultural impact on interpersonal communication and highlights the importance of observational understanding.