Bit (b) is the smallest unit to measure digital data where as Byte is commonly used as the
smallest addressable unit of storage in many computer systems. A Nibble can be formed by grouping 4 bits, can have up to 16 values.
Below chart illustrates the comparison between Decimal (SI Standard) and Binary (IEC Standard) units.
Relationship between different Data Measurement Units
Each Decimal unit (kb, kB, Mb, MB, Gb, GB, Tb, TB, Pb, PB, Eb, EB, Zb, ZB, Yb, YB) is 1000 times larger than its preceding unit where as each Binary unit(Kibit, KiB, Mibit, MiB, Gibit, GiB, Tibit, TiB, Pibit, PiB, Eibit, EiB, Zibit, ZiB, Yibit, YiB) is 1024 larger than the preceding unit.
Below table represents how these units are related to each other.