X86-64 is the 64-bit version of x86, also known as AMD 64 and Intel 64. The first computers that apple shipped with Intel processors only supported x86 (32-bit)

X86-64 is the 64-bit version of x86, also known as AMD 64 and Intel 64. The first computers that apple shipped with Intel processors only supported x86 (32-bit). The most recent version of macOS removed support for x86, only allowing 64-bit apps to run. https://en.wikipedia.org/wiki/X86-64 https://en.wikipedia.org/wiki/X86-64