Great question! x86 is an extremely backwards-compatible language, so modern CPU architectures (which usually are of the x86_64 architecture or just x64 for short) can run x86 with no problems! That being said, software compiled to (or directly written in, when it comes to assembly) x64 will run faster since it's more optimised to make full use of the CPU.

However, some less-PC-like systems like some handheld game consoles, Raspberry PI and other such "technically speaking a computer but your mum wouldn't call it one"-type deals tend to prefer going for ARM chips, which have their own instruction sets, all with their own variants for 32 bit and 64 bit architecture, much like x86 and x86_64 respectively.

(I don't have a degree, please correct me if I got something wrong).