Replacement for the older x86 or 32-bit platform, 64-bit is a computer or software program that is capable of transferring 64-bits at a time. With respect to hardware, 64-bit is referencing the width of the registers on a computer's microprocessor or the computer bus; sometimes called WOW64 and x64.

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Also see: 8-bit, 16-bit, 24-bit, 32-bit, 64-bit, AMD64, Bit, IA-64, Video terms