A fucked up instruction set architecture, or ISA, based on the Intel 8086 microprocessor. Really confusing to program with in Assembler. Supports 8, 16, 32 and now 64-bit instructions and data. x86 is classified as "CISC" or "Complex Instruction Set Computer".
The two largest x86 chip producers are Intel and Advanced Micro Devices (AMD).
Jimmy: x86 is awesome.
Larry: You've clearly never done any assembly programming on one, have you?
Jimmy: ... Uh, no?
Larry: Thats what I thought... n00b.