But this is not suitable for writing source code. That means you can do things like bold or italics, or even underline. By default, TextEdit stores files in Rich Text Format. We're going to go ahead and open up TextEdit, and the first thing that you'll notice is this formatting bar. I'll be using TextEdit since I'm on a Mac. Both applications allow you to write source code.
If you're on a PC, you already have a text editor available to you. This means that word processing applications aren't suitable for writing code, because by default, they insert bits of information in files that prevent them from being plain text. In other words, we write it without special formatting, like bold, italic, or different font types. It's the instructions we have for the computer, and it's written in plain text. Writing source code is what programmers do all day.