ARM (Advanced RISC Machine) CPUs well known from the mobile phone market, is a family of RISC (reduced instruction set computing) architecture processors, designed for various applications. Compared to CISC (complexe information set computing) processors like x86, ARM designs are focused on dedicted usecases and thereofore use to have lower power consumption on a similar performance level.
Most ARM processor developments that suit for the Embedded market come from NXP, TI, Rockchip, just to name some.
Packed in differnet ready to go small form factor modules, ARM desings are easy to deploy to your desing.