<dfn>Partials</dfn> in Sass are separate files that hold segments of CSS code. These are imported and used in other Sass files. This is a great way to group similar code into a module to keep it organized.
Names for partials start with the underscore (`_`) character, which tells Sass it is a small segment of CSS and not to convert it into a CSS file. Also, Sass files end with the `.scss` file extension. To bring the code in the partial into another Sass file, use the `@import` directive.
For example, if all your mixins are saved in a partial named "\_mixins.scss", and they are needed in the "main.scss" file, this is how to use them in the main file:
Note that the underscore and file extension are not needed in the `import` statement - Sass understands it is a partial. Once a partial is imported into a file, all variables, mixins, and other code are available to use.