A Byte is a unit of memory on a computer equaling 8 bits.
A Word a fixed sized unit of memory on a computer handled as a unit by the instruction set or the hardware of the processor (it is an important characteristic of any specific processor design or computer architecture) it will normally be a multiple of bytes. Modern processors usually have a word size of 1, 2, 4, or 8 bytes - (8, 16, 32, or 64 bits).
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They are all measurements of memory. A bit is short for Binary Digit, and can contain a 1 or 0. A nibble is 4 bits. A byte is 8 bits, and is the amount of bits needed to store one character, such as a letter or a digit or a punctuation symbol. A word is the amount of bits that can be manipulated as a unit by the CPU of a computer. That varies from one computer to another. So for some computers, they are capable of processing more bits at once than another. So a computer may have a 16 bit word, while another could have a 64 bit word, for example.
computer stores data in binary format i.e 0 and 1
1 bit can be either 0 or 1
8 bits = 1 byte
16 bits = 1 word or 2 bytes=1 word