Analog and Digital
Analog
The real world is largely continuous shades of gray, not just black and white (digital). Anything we measure in the real world is usually analog. Temperature, voltage, and water pressure are all examples of things which vary in a smooth, continuous way.
Most electrical signals from temperature, thermal, and other sensors are analog signals. These vary smoothly from large to small, low to high, slow to fast.
Analog circuits work with these continuous signals. They deal with amplifying very small signals, screening out noise, controlling power, and so forth.
Digital
Meanwhile, another view of the world exists in discrete chunks. Money, shoes, and pages in a book are examples of discrete things. Electrical signals can be ...
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