why assembly language use register

Assembly language uses registers because they provide fast access to data and instructions. Registers are small, high-speed storage locations that are built directly into the processor. They can hold data temporarily during processing and can perform arithmetic and logical operations directly on the data stored in them. By using registers, assembly language programs can efficiently manipulate data and execute instructions without the need to access slower memory locations. Additionally, registers allow for efficient communication between different parts of the processor and can be used to store intermediate results during complex calculations.