Definition

NIBBLE - In computing, a nibble (often nybble or even nyble to match the vowels of byte) is a four-bit aggregation,or half an octet. As a nibble contains 4 bits, there are sixteen possible values, so a nibble corresponds to a single hexadecimal digit (thus, it is often referred to as a "hex digit" or "hexit").

 BYTE - A byte is a unit of measurement used to measure data. One byte contains eight binary bits, or a series of eight zeros and ones. Therefore, each byte can be used to represent 2^8 or 256 different values. The byte was originally developed to store a single character, since 256 values is sufficient to represent all standard lowercase and uppercase letters, numbers, and symbolsA byte is a unit of measurement used to measure data. One byte contains eight binary bits, or a series of eight zeros and ones. Therefore, each byte can be used to represent 2^8 or 256 different values.

 WORD - word is a term for the natural unit of data used by a particular processor design. A word is basically a fixed-sized group of bits that are handled as a unit by the instruction set and/or hardware of the processor. The number of bits in a word (the word size, word width, or word length) is an important characteristic of any specific processor design or computer architecture.