What does it mean when words are drawn blue in Mathematica?

Question

Here is what I mean:

Sometimes I don't know why, I get the names of functions blue. Is there any special reason?

Answer 1

It just means it's an as-yet-undefined symbol.

Answer 2

It's a form of syntax coloring and/or spell checking. It means that a symbol named "SavePlogggts" has not yet been defined. As soon as you evaluate that cell it will define the symbol and it will turn black.