What does each color in a text editor represent?

I know this is truly a dumb question, but I can’t seem to find any sort of FAQ or whatever on any site. I’m just starting to learn HTML and CSS and I’m using a text editor (Notepad++). Now text editors like notepad++ and textwrangler all colorize the code so it is easily recognizeable, is there a specific color code/legend for each editor, or is it universal (and if so…is there a link that tells me what each color represents).