Mixins are ways to reuse styles across your project and their ability to take arguments makes them very powerful and flexible. The @extend directive allows you to reuse styles by letting one selector inherit those of another. In some respects they both do the same thing so which one should you use?
Being able to reuse code across a project has benefits in maintenance and development efficiency. So far in this series, I’ve talked about the @import and @extend directives and both help to make your code more reusable. Sass also offers the @mixin directive as a means for reusing code.