A smallest and fastest form of memory inside a central processing unit (CPU).
An 8 bit CPU has 8 bit registers, a 32 bit CPU has 32 bit registers and so on.
Within the CPU there are special purpose registers such as the Program Counter and the Memory Address Register.
There are also general purpose registers which are used by any program being run at that instant to store intermediate data. The final results of calculations and comparisons are moved out of the registers and into main memory, which is RAM.
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Click on this link: CPU registers