Economics is the social science that analyzes the production, distribution, and consumption of goods and services. The term economics comes from the Ancient Greek from + , hence "rules of the house"...

 and commerce
While business refers to the value-creating activities of an organization for profit, commerce means the whole system of an economy that constitutes an environment for business. The system includes legal, economic, political, social, cultural, and technological systems that are in operation in any...

 define an end user as the person who uses a product
Product (business)
In general, the product is defined as a "thing produced by labor or effort" or the "result of an act or a process", and stems from the verb produce, from the Latin prōdūce ' lead or bring forth'. Since 1575, the word "product" has referred to anything produced...

. The end user or consumer
Consumer is a broad label for any individuals or households that use goods generated within the economy. The concept of a consumer occurs in different contexts, so that the usage and significance of the term may vary.-Economics and marketing:...

 may differ from the person who purchases the product. For instance, if a zookeeper purchases elephant
Elephants are large land mammals in two extant genera of the family Elephantidae: Elephas and Loxodonta, with the third genus Mammuthus extinct...

Pet food
Pet food is plant or animal material intended for consumption by pets. Typically sold in pet stores and supermarkets, it is usually specific to the type of animal, such as dog food or cat food...

 the purchaser of the product is different than the end user (the elephant) of that product.
An end user of a computer system is someone who operates the computer, as opposed to the developer of the system who creates new functions for end users.

In contracts, the term 'end user' becomes a legal construct referring to a non-reseller
A reseller is a company or individual that purchases goods or services with the intention of reselling them rather than consuming or using them. This is usually done for profit...

. This definition characterizes the store the zookeeper bought food from as a non-end user, but the zookeeper as an end user. This legal construct most often appears in End-User License Agreements, also known as EULAs.the end user is the one who uses the product irrespective of who developes it or who buys it.
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