Bit (Binary Digit)

A binary digit is logical 0 and 1 representing a passive or an active state of a component in an electric circuit.

Nibble

A group of 4 bits is called nibble.

Byte

A group of 8 bits is called byte. A byte is the smallest unit, which can represent a data item or a character.

Word

A computer word, like a byte, is a group of fixed number of bits processed as a unit, which varies from computer to computer but is fixed for each computer.

The length of a computer word is called word-size or word length. It may be as small as 8 bits or may be as long as 96 bits. A computer stores the information in the form of computer words.

Kilobyte (KB)

1 KB = 1024 Bytes

Megabyte (MB)

1 MB = 1024 KB

GigaByte (GB)

1 GB = 1024 MB

TeraByte (TB)

1 TB = 1024 GB

PetaByte (PB)

1 PB = 1024 TB