Question: what are the different bytes?
Answer: Nibble. A nibble is 4 bits.
Byte. Today, a byte is 8 bits.
Kilobyte (KB) A kilobyte is 1,024 bytes.
Megabyte (MB) A megabyte is 1,048,576 bytes or 1,024 kilobytes.
Gigabyte (GB) A gigabyte is 1,073,741,824 (230) bytes. ... 
Terabyte (TB) ... 
Petabyte (PB) ... 
Exabyte (EB)