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Dean Wagman
21,591 Points.scss files beginning with an underscore function similar to include files in other languages and are called partials. They can be used to separate a certain block of styling that you can import into other files. They being in Underscores so at compile time 'sass compile, compass compile', the compiler knows not to convert those files into css files.
It looks like you've completed a lot of lessons in a short amount of time. Might I suggest taking time to fully understand what is going on in the lessons, and play around with the tools.
Also, look up some blog posts and discussions on the technology to get different viewpoints and explanations if something didn't click. Documentation is your best friend. http://sass-lang.com/guide