- When we say 32 or 64-bit, we’re referring to a collection of capabilities associated with 32 or 64-bit CPUs, such as memory addresses or software
- What determines whether a CPU is 32 or 64-bit? Typically, we see a correlation between the CPU’s bits and the size of its general purpose register.
- On today’s CPUs, the size of a memory address is the same as the size of its registers, though this wasn’t always the case (see Moto 68000)
https://stackoverflow.com/questions/3594394/what-are-16-32-and-64-bit-architectures?rq=3