The Registers are very fast computer memory which is used to execute programs and operations efficiently. This does by giving access to commonly used values, i.e., the values which are in the point of operation/execution at that time.
The sole purpose of having a register is fast retrieval of data for processing by CPU. Though accessing instructions from RAM is comparatively faster with a hard drive, it still isn’t enough for the CPU. For even better processing, there are memories in the CPU which can get data from RAM which are about to be executed beforehand.
AH - Higher Part, AL - Lower Part
We cannot access the higher part of the RSI, RDI,... registers/
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