What is the word length of a computer? how does the word length of a computer affect what the computer is able to compute?

The most basic unit of information is a bit, a BInary digiT. It can have either 0 or 1 as values. Four bits form a nybble, which can have values from 0 to 15. Two nybbles, 8 bits, is a byte which can have values 0 to 255. When computers got wider than 8 bit processors the bytes were combined to make words. On a 32 bit machine, the word size is 4 bytes or 32 bits. The range of values that a 32 bit machine can handle at one time is 0 to 2^32 - 1. A 64 bit machine is 8 bytes or 64 bits wide and can handle 0 to 2^64 - 1 at one time.