Host

Everyday and cultural uses

In hospitality, a host is the person who receives visitors at home, arranges a meal, or welcomes people to an event. In broadcasting, live performance, and online media, the host introduces segments, keeps the program organized, and helps the audience follow what is happening. The word can also be used more loosely for the main location or person around whom an event is centered.

Popular culture uses the word in titles of albums, novels, games, and fictional groups. These uses are specific to each work, but they draw on the sense of something that gathers, contains, or directs others. In fiction, a host can also suggest possession, transformation, or an uneasy relationship between two beings.

Religion and ritual

In Christianity, the heavenly host refers to the army or multitude of angels in heaven. The phrase is traditional and poetic, emphasizing grandeur, order, and divine service. Host is also a liturgical term for the bread used in the Eucharist, especially when it is consecrated during Mass or a similar service.

Science, medicine, and technology

In biology, a host is an organism that harbors another organism. That second organism may be a parasite, but it may also be a mutual partner or a commensal species. The relationship may harm the host, benefit both organisms, or affect one more than the other. This broad scientific sense is common in ecology, microbiology, and evolutionary biology.

In computing, a host is a computer or device connected to a network, often identified by an address and capable of providing resources or services to other computers. The term may also refer to the physical machine that runs a virtual machine or other guest system. In this setting, the host is the platform that supports access, communication, or computation.

Psychology

In discussions of dissociative identity disorder, the host is the identity state that most often handles ordinary life and is commonly regarded as the primary personality. Clinicians and researchers use the term carefully, because experiences can differ widely and because descriptions of identity in dissociative disorders have changed over time.

Across all of these meanings, host points to a central idea: one thing receives, supports, carries, or presents another. That flexibility makes the word useful in religion, science, media, and everyday life, while also creating the need to read it within its proper context.