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A half-drow generally has dusky skin, silver or white hair, and human eye colors. They can see around 60 feet (18.3m) with dark vision, but otherwise have no other drow traits or abilities.
Half-drows are often conceived when a male drow mates with one of his human female slaves, or when outcast drow mate with surface-dwelling species.
Xandra Shobalar encountered a merchant in Mantol-Derith, ostensibly human, who was in fact half-drow. Perhaps indicative of the drow view of such things, she found his suspected nature to be appalling.