When you’re developing, it’s often useful to have many smaller style sheets rather than one huge one. This can be a pain for web performance. If you have five style sheets on a particular page, it can make the page loading times much slower because each style sheet needs a separate request to load.
Importing is a process by which a lot of files are turned into a few files. Sass has a neat little trick whereby the smaller style sheets are imported into the larger one as it is compiled into CSS. All you need to type is @import, followed by the name of the Sass file you want to import. You can mix Original Sass and SCSS at will with imports—it’s all the same. Just say @import “sub_page”; and you’re done!
If you don’t want a Sass file ...