In SCSS, what is the method for grouping and reusing a set of classes and styles?

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The method for grouping and reusing a set of classes and styles in SCSS is called a mixin. A mixin is a block of code that can be reused across multiple styles and classes. Mixins are defined using the @mixin directive and can be included in styles using the @include directive. This allows developers to modularize their code and make it more maintainable and scalable.