Bit = A bit is a value of either a 1 or 0 (on or off).
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 1,024 Kilobytes. OR 1,048,576 bytes

Gigabyte (GB) = A Gigabyte is 1,024 Megabytes, or 1,048,576 Kilobytes or 1,073,741,824 (2^30) bytes.

Terabyte (TB) = A Terabyte is 1,024 Gigabytes, or 1,048,576 Megabytes. or 1,099,511,627,776 (2^40) bytes.

Petabyte (PB) = A Petabyte is 1,024 Terabytes,or 1,048,576 Gigabytes, or 1,073,741,824 Megabytes or 1,125,899,906,842,624 (2^50) bytes.

Exabyte (EB) = An Exabyte is 1,024 Petabytes, or 1,048,576 Terabytes, or 1,073,741,824 Gigabytes, 1,099,511,627,776 Megabytes, or 1,152,921,504,606,846,976 (2^60) bytes.

Zettabyte (ZB) = A Zettabyte is 1,024 Exabytes, or 1,048,576 Petabytes, or 1,073,741,824 Terabytes, or 1,099,511,627,776 Gigabytes, or 1,125,899,910,000,000 Megabytes., or 1,180,591,620,717,411,303,424 (2^70) bytes.

Yottabyte (YB) = A Yottabyte is 1,024 Zettabytes, or 1,048,576 Exabytes, or 1,073,741,824 Petabytes, or 1,099,511,627,776 Terabytes, or 1,125,899,910,000,000 Gigabytes, or 1,152,921,500,000,000,000 Megabytes, or 1,208,925,819,614,629,174,706,176 (2^80) bytes.

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