Analog
- All physical quantities are analog.
- Analog means that the quantity can take any value between its minimum value and maximum value.
- Example :
i) Temperature, can take any value[-1,12.8,25.002,... etc.].
ii) Sine waves are analog.
Digital
- Digital means that the quantity can take specific levels of values with specific offset between each other.
- Example :
i) English alpha consists of 26 letter, there is no letter between A and B.
ii) Square waves are Digital.