You can create partial Sass files that contain little snippets of CSS that you can include in other Sass files. This is a great way to modularize your CSS and help keep things easier to maintain.

• Separate files - have modularity (separation of concerns)
• Partial files should start with _ in their names - to skip being compiled (for e.g. _button-styles.scss)
• To use - we use the @import syntax

Example

@import './_button-styles'