what is the difference between ARM and x86 chipsets?

ARM uses Reduced Instruction Set Computing Architecture (RISC) whereas x86 uses Complex Instruction Set Computing Architecture (CISC). ARM executes single instruction per cycle whereas x86 executes complex instructions in multiple cycles. This allows softwares to be optimized for performance against ARM chipset as opposed to an 86 hardware approach to optimize. It would also be interesting to mention that ARM uses higher memory and less registers compared to x86.