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You can see that the binary representation of the decimal number $1$ is "$1$." A single binary digit is called a bit. Notice that the word "bit" comes from $\underline{\textit{b}}$inary dig$\underline{\textit{it}}$.  When writing binary numbers more formally, we tend to use the subscript $2$. Therefore, we would write the decimal number $5$ whose binary notation is "$101$" as $101_2$. This is so that there is less confusion between decimal numbers and binary numbers. Today, computers use binary numbers because they are simple to work with. Numbers can be encoded in binary and stored using the idea of switches. Each switch represents either a $1$ or a $0$ depending on whether the switch is on or off. Therefore, by looking at a switch, or set of switches, you could tell what number is being displayed. The storage of large amounts of information can be allowed by having several switches. "The digital technology which uses this system could be a computer, calculator, digital TV decoder box, cell phone, burglar alarm, watch etc." (Brennan, 2016).