x86, x64, ARM

[UserNano15]

Can anyone tell me exactly the differences between these three computer architectures. I believe x86 is 32-bit and x64 is 64-bit but correct me if I'm wrong.

[a k n]

x86 and x64 are CISC architectures,.
The x86 architecture is based on the 8086 processor by Intel, 8086 was 8-bit but the "enhanced" x86 is 32-bit.
The x64 was introduced by AMD, which was 64-bit and backwards compatible with x86.

ARM is a family of RISC architectures. The ARMv8-A version, for example is 64-bit, previous versions like ARMv7-A are 32-bit.


References:
https://en.wikipedia.org/wiki/X86
https://en.wikipedia.org/wiki/X86-64
https://en.wikipedia.org/wiki/ARM_architecture

[UserNano15]

Thanks a lot

[chrisname]

ARMv8A supports 64 and 32-bit modes, called AArch-64 and AArch-32. Also, the 8086 was a 16-bit processor.