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A designer is a person who makes designs for objects. A fashion designer designs clothing, a web designer designs web pages, and an automobile designer designs automobiles. In each case, the designer works with the help of a technician or engineer who understands deeper level concepts of manufacturing and engineering, and the designer themself is largely confined to work at a surface level.
More formally, a designer is an agent that "specifies the structural properties of a design object". In practice, anyone who creates tangible or intangible objects, products, processes, laws, games, graphics, services, and experiences is referred to as a designer.