X-bit CPU?

I can not have a clear answer on the subject:
- What does a 4-bit processor, 8-bit, 16 bit ... ?

Thank you in advance for your answers

A 4-bit processor means that the processor has a data bus and address of 4 bits. It's the same thing for 16-bit processor, 32bit, etc.

data buses and addresses are always the same size?

salvation, a processor with 4 or 8 or 16, this means that the data buses and address are at this size (4 or 8-bit or 16 times at the same time), now is 16 bits and l extension this back until the 32-bit, but watch the data bus and address was not always the same size.

Quote:

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data buses and addresses are always the same size?

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Let that if you carry 16 bits of data, it goes much arranger if you have addresses of at least 16 bits, because you're going to do your calculations directly, without having to "cut" your data.
That said, unless I am mistaken, this is not mandatory (but very often the case on the most common architectures).

X86 processors had a 16-bit address bus of 20 bits, the 32-bit can use 36 lines address since the Pentium Pro. When we speak of the number of bits a processor usually talking about the size of data that is expected to run natively