While the earth is a sphere, humans, until recently, can really only move conveniently on its surface. For the purposes of travel and mapping, the earth can be represented by a plane with 4 cardinal directions (no up or down).
The generally accepted nomenclature of East and West comes about because the international 0 degree longitude passes through Greenwich England. (Long history, they were challenged by Paris but managed to “win”). Anything “left” (ie North America) is “West” and anything “right” of Greenwich is “East”.
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