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==Computer architecture==
In [[Computer architecture]], an '''instruction''' is a single operation of a [[processor]]. The width of an instruction depends on the architecture of the [[computerPlatform platform(computing)|platform]], but it is usually from 4 to 64 [[bit]]s wide. The content of an instruction is determined by the platform's [[Instruction Set Architecture]] (ISA), but it usually contains an [[opcode]], which determines the type of instruction, [[register]] sources and destination operands, and maybe an immediate field.
 
==Computer science==