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In computer science, a word is a basic unit of data that a computer’s processor can handle at one time. The size of a word, typically measured in bits, is a crucial factor in determining the overall performance and architecture of a system. Common word sizes include 16-bit, 32-bit, and 64-bit. The word size affects the amount of memory a processor can address and the speed at which it can process data. For example, a 64-bit processor can access more memory and perform calculations on larger numbers more efficiently than a 32-bit processor. Word size also influences the design of instruction sets and data structures. Understanding word size is fundamental to understanding computer architecture and low-level programming.