- 2-state device: it's like a switch on a wall,it can either be on or off
- Binary: is a number system. It represents two-states because it has only two digits; 0 &1.
- ASCII: American Standard Code for Information Interchange. This is used to represent characters in binary. It has 256 different characters.
- Unicode: it is the same as the ASCII but it has more characters.
- With 3 bits we can represent 8 different values and with 4 bits we can represent 16 different values.
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