Proxemics is the study of human use of space and the effects that population density has on behavior, communication, and social interaction. Proxemics is one among several subcategories in the study of nonverbal communication, including haptics (touch), kinesics (body movement), vocalics (paralanguage), and chronemics (structure of time).

Edward T. Hall, the cultural anthropologist who coined the term in 1963, defined proxemics as "the interrelated observations and theories of humans' use of space as a specialized elaboration of culture". In his foundational work on proxemics, The Hidden Dimension, Hall emphasized the impact of proxemic behavior (the use of space) on interpersonal communication. According to Hall, the study of proxemics is valuable in evaluating not only the way people interact with others in daily life, but also "the organization of space in [their] houses and buildings, and ultimately the layout of [their] towns". Proxemics remains a hidden component of interpersonal communication that is uncovered through observation and strongly influenced by culture.

The distance surrounding a person forms a space. The space within intimate distance and personal distance is called personal space. The space within social distance and out of personal distance is called social space, and the space within public distance is called public space.

Personal space is the region surrounding a person which they regard as psychologically theirs. Most people value their personal space and feel discomfort, anger, or anxiety when their personal space is encroached. Permitting a person to enter personal space and entering somebody else's personal space are indicators of perception of those people's relationship. An intimate zone is reserved for close friends, lovers, children, and close family members. Another zone is used for conversations with friends, to chat with associates, and in group discussions. A further zone is reserved for strangers, newly formed groups, and new acquaintances. A fourth zone is used for speeches, lectures, and theater; essentially, public distance is that range reserved for larger audiences.

Entering somebody's personal space is normally an indication of familiarity and sometimes intimacy. However, in modern society, especially in crowded urban communities, it can be difficult to maintain personal space, for example when in a crowded train, elevator, or street. Many people find such physical proximity to be psychologically disturbing and uncomfortable, though it is accepted as a fact of modern life. In an impersonal, crowded situation, eye contact tends to be avoided. Even in a crowded place, preserving personal space is important, and intimate and sexual contact, such as frotteurism and groping, is unacceptable physical contact.

A person's personal space is carried with them everywhere they go. It is the most inviolate form of territory. Body spacing and posture, according to Hall, are unintentional reactions to sensory fluctuations or shifts, such as subtle changes in the sound and pitch of a person's voice. Social distance between people is reliably correlated with physical distance, as are intimate and personal distance, according to the delineations below. Hall did not mean for these measurements to be strict guidelines that translate precisely to human behavior, but rather a system for gauging the effect of distance on communication and how the effect varies between cultures and other environmental factors.

Hall described the interpersonal distances of humans (the relative distances between people) in four distinct zones:

The distances mentioned above are horizontal distance. There is also vertical distance that communicates something between people. In this case, however, vertical distance is often understood to convey the degree of dominance or sub-ordinance in a relationship. Looking up at or down on another person can be taken literally in many cases, with the higher person asserting greater status.