SoC is from the embedded system development world - as more and more coprocessors were being put into the same chip to consolidate board space and power efficiency, it wasn’t “just” a cpu - it had the CPUs, GPUs, DSPs, and other coprocessors in one
x86 has moved a lot closer to this architecture over the years, but you still generally have a separate chipset controller on the motherboard the CPU interfaces with
in other words, the cpu
For most intents and purposes
SoC is from the embedded system development world - as more and more coprocessors were being put into the same chip to consolidate board space and power efficiency, it wasn’t “just” a cpu - it had the CPUs, GPUs, DSPs, and other coprocessors in one
x86 has moved a lot closer to this architecture over the years, but you still generally have a separate chipset controller on the motherboard the CPU interfaces with