A person who creates maps or a device/software that performs mapping functions. In computing, it refers to software that transforms data from one format to another.
From 'map' (from Medieval Latin 'mappa' meaning 'cloth' or 'napkin' on which maps were drawn) plus the agent suffix '-er'. The computing sense emerged in the mid-20th century as data processing became more sophisticated, extending the spatial metaphor to data transformation.
Medieval maps were literally drawn on cloth napkins, which is why we call them 'maps' - and today's digital mappers continue this ancient tradition of transforming the unknown into the visible, whether charting territories or data structures. The GPS in your phone makes you a casual cartographer every time you search for directions.
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