Computer architecture is the study of an abstract model of a stored-program computer, defining its operational structure and mechanisms. It establishes the rules governing how software interacts with hardware, primarily encompassing the design of the central processing unit, the memory hierarchy, and the input/output interfaces. Key components include the instruction set architecture (ISA), which dictates the available commands and data formats, and the microarchitecture, which specifies the internal implementation details of the processing core. The design must efficiently manage data flow and execution cycles, utilizing concepts such as pipelining, caching, and addressing modes to maximize computational throughput. Modern architectures continuously evolve to manage increasing data demands and improve energy efficiency, balancing performance goals with practical limitations imposed by physical signaling and heat dissipation.