S.no CSS SASS
1. Codes are Long Code is Short
2. Unstructured Document Structured Document
3. Nesting:-Code Block are not Nested Nesting:- Allow the nested code to be included in each other
4. Suitable for small web applications Suitable for small web applications as well as large user interfaces
5. Offers less flexibility Has an ability to add mixin, functions, variable etc
6. Multiple stylesheets cannot be joined Multiple Stylesheets can be joined into only one Style Sheet
7. Darken and Lighting Functions are not available Darken and Lighting Functions are available
8. Mathematical functions are not available Mathematical functions are available
BY Best Interview Question ON 18 Jan 2019