SASS and LESS both are the preprocessor of CSS that enhance the development of CSS but SASS is powerful as compared to LESS. Bootstrap provides a whole framework for creating the user interfaces that include the widgets, the grid layout system, the typographic styling, the Interactive Menu bars and many more. Bootstrap have used many preprocessors in the past for the CSS source code but out of SASS and LESS, Bootstrap uses LESS pre-processor and it has also included various customisations by using the fewer variables and the fewer components.


But Recently BOOTSTRAP 3 has also given the SASS codebase as an alternate option but BOOTSTRAP 4 is being built completely on SASS codebase and this is the first time Bootstrap has using SASS.

BY Best Interview Question ON 18 Jan 2019