First of all, what is a bit (short for binary digit)? You can think of it as an atom which can be used to build information. In fact, a bit has only two unique states: zero or one. Sometimes you can find another definition like “yes/no”, “on/off” or “true/false”. But, all this stuff boils down to the same thing.
To represent more meaningful information other than zero or one we need a
bunch of bits that can be grouped together. For example, eight bits are able to produce 256 (2^8) unique numbers: Continue reading Intro in Binary Representations and Bit Manipulation