What's the difference between a word and byte?

Question

I\'ve done some research. A byte is 8 bits and a word is the smallest unit that can be addressed on memory. The exact length of a word varies. What I don\'t understand is wh

Answer 1

A word is the size of the registers in the processor. This means processor instructions like, add, mul, etc are on word-sized inputs.

But most modern architectures have memory that is addressable in 8-bit chunks, so it is convenient to use the word "byte".