x64 means x86-64 in common parlance. Apple silicon would be an arm64 platform in comparison. Lots of software is compiled for both right now, but Apple is aband

x64 means x86-64 in common parlance. Apple silicon would be an arm64 platform in comparison. Lots of software is compiled for both right now, but Apple is abandoning x86-64 so at some point in the future, software will stop being built for that platform (just like ppc before x86).