In programming, the “source code” is the underlying architecture that makes a program or operating system work. It is what the programmer writes that is then compiled into the binary commands that make our devices function and our programs run. On one level, it is just row after row of commands, but, together, the effect is more than the sum of the parts. It gives the computer, tablet, or smartphone the instructions that allow them to “live” and do all the amazing things that they do.