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This dates back a bit to the days of dos and the limitations of 20 bit address bus when a program could be written using a memory model.
Small: The whole program and data fits in 64K.
Large: The code fits in 64K, the data sits in another 64K segment.
Huge: Fu...ing big.
But in simple terms, depending on 'size_t' a near pointer is 16 bits wide and a far or huge pointer is 32 bits wide.
It's faster to manipulate near pointers.
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