Byte:
The most important use for a byte is holding a character code. We have discussed it earlier.
Kilobyte
Technically a kilobyte is 1024 bytes, but it is often used loosely as a synonym for 1000 bytes. In decimal systems, kilo stands for 1000 but in binary systems a kilo is 1024 (210).
Kilobyte is usually represented by K or Kb. To distinguish between a decimal K (1000) and a binary K (1024), the IEEE (Institute of Electrical and Electronics Engineers) standard has suggested following the convention of using a small k for a decimal kilo and a capital K for a binary kilo but this convention is by no means strictly followed.
Megabyte
Megabyte is used to describe data storage of 1048576 (220) bytes but when it is used to describe data transfer rates as in MBps, it refers to one million bytes. Megabyte is usually abbreviated as M or MB.
Gigabyte
Gigabyte is used to describe the storage of 1,073,741,824 (230) bytes and One gigabyte is equal to 1,024 megabytes. Gigabyte is usually abbreviated as G or GB.
Terabyte
Terabyte is 1,099,511,627,776 (240) bytes which is approximately 1 trillion bytes. Terabyte is sometimes described as 1012 (1,000,000,000,000) bytes which is exactly one trillion.
Petabyte
Petabyte is described as 1,125,899,906,842,624 (250) bytes. A Petabyte is equal to 1,024 terabytes.
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