32-bit and 64-bit Architecture
Advanced RISC Machines (ARM)
ARM is a family of RISC instruction set architectures for computer processors, configured for various environments.
ARM is the most popular instruction set architecture for embedded devices, with more than 100 billion devices through 2016.
Installing GDB for ARM: https://interrupt.memfault.com/blog/installing-gdb
ARM vs x86
The key difference is that ARM works in RISC, while x86 architecture works in CISC. StackOverflow.
Arm64 is the 64-bit version.
AArch = Arm Architecture