What is Bootstrap?


Bootstrap is the most popular front-end framework for building responsive, mobile-first apps.

What is CSS?


CSS stands for Cascading Style Sheets. CSS simply tell browsers how web pages should be displayed i.e., which color or size fonts should have, how wide a box should be, etc.

 

Document Object Model (DOM)


The Document Object Model (DOM) is a representation of HTML or XML documents as a tree structure