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In computer science, a word is a basic unit of data of a fixed size that can be processed by a computer’s central processing unit (CPU) in a single operation. The word size is a crucial attribute of a computer architecture, as it determines the amount of data the processor can handle simultaneously. Common word sizes include 16-bit, 32-bit, and 64-bit. The word size affects the computer’s performance, memory addressing capabilities, and the range of values that can be directly represented. For instance, a 64-bit word size allows for larger memory addresses and more complex calculations compared to a 32-bit word size. Processors are often categorized by their word size (e.g., a 64-bit processor).