Updated on May 1, 2019

- A digit may stand for a finger. The use of ten fingers for counting may have given rise to the Decimal Number System.
- A digit may stand for a symbol of a Number System.
- A Number System has a Base (or Radix).
- The Decimal Number System (Base 10) uses ten digits : 0, 1, 2, 3, 4,5, 6, 7, 8, 9
- The Binary Number System (Base 2) uses two digits : 0 and 1
- An Octal Number System (Base 8) uses eight digits : 0, 1, 2, 3, 4, 5, 6, 7
- A Hexadecimal Number System (Base 16) uses sixteen digits : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F
- Most computers use Base 2 internally. Since binary numbers are long, they are expressed externally using Octal and Hexadecimal.
- Some early computers and calculators use Base 10.
- Computers and programs support easy Conversion between the Number Systems.
- Computers may be digital, analog or hybrid.
- There are converters from digital to analog (and vice versa).
- Digital displays (read outs) are common.

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