The ARM architecture is a family of reduced instruction set computer (RISC) architectures for computer processors. There have been several generations of the ARM design with the original being ARM1 going all the way to ARMv7 in 32-bit. ARMv8-A architecture and higher come with 64-bit support.
ARM is a little Endian default chip originally introduced in 1985. The name was originally an acronym for Acorn RISC Machine and later Advanced RISC Machines.
ARM is popular due to its low cost, minimal power consumption, and lower heat generation than the competition. This makes ARM processors desirable for light, portable, battery-powered devices such as smartphones, laptops and tablet computers, and embedded systems. Nevertheless, ARM processors are also used for desktops and servers, including the world’s fastest supercomputer.