An end user is a person who uses a product. The term is based in the fields of economics and commerce. A product may be purchased by several intermediaries, who are not users, between the manufacturer and the end user, or be directly purchased by the end user as a consumer. For example the end user of a pharmaceutical product is the patient who takes it, rather than distributors, pharmacists and physicians who may purchase it in their behalf; or the user can buy the product at a drugstore.
An end user of a computer system or software is someone who uses it.
In contracts in some jurisdictions, the term end user is a legal term for a non-reseller. This legal construct is used in End-User License Agreements (EULAs); the end user is the user, rather than purchaser, of the subject of the Agreement.