Opcode
Noun · Development
Definitions
Operation code — the numeric portion of a machine language instruction that specifies the operation to perform, such as addition, memory load, or jump.
In plain English: A number that tells the processor exactly what operation to perform — the raw instruction behind every line of code you write.
Example: "0x90 is the NOP opcode on x86 — it tells the CPU to do absolutely nothing for one cycle."