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In computer architecture, a word is a basic unit of data that a processor can handle at a time. The word size represents the number of bits the processor can process simultaneously, influencing the system’s performance and memory addressing capabilities. For example, a 32-bit processor typically uses a 32-bit word size, while a 64-bit processor uses a 64-bit word size. The word size affects the maximum amount of memory the processor can directly address and the efficiency of data processing. Larger word sizes generally allow for more efficient handling of larger data chunks and more extensive memory addressing.