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There are different ways to classify electrical circuits. One very important way is to classify a circuit or system as either analog or digital but what does that mean? What’s analog vs digital?

If you’ve been an electronics enthusiast for a while, have taken courses in electronics or read books on the subject you probably have at least an intuitive sense of the difference between analog and digital.

We live in an analog world. There are an infinite amount of colors to paint an object (even if the difference is indiscernible to our eye), there are an infinite number of tones we can hear, and there are an infinite number of smells we can smell. The common theme among all of these analog signals is their infinite possibilities.
Digital signals and objects deal in the realm of the discrete or finite, meaning there is a limited set of values they can be. That could mean just two total possible values, 255, 4,294,967,296, or anything as long as it’s not ∞ (infinity).