Bootstrap
Updated: 04/30/2020 by Computer Hope
Bootstrap is a framework for designing and developing the front end of websites. Using Bootstrap's preset HTML (hypertext markup language), CSS (cascading style sheets), and JavaScript components, a web designer can create responsive, mobile-first websites that are compatible with a wide array of browsers and devices.
Originally called Twitter Blueprint, Bootstrap was developed in 2011 by a team at Twitter led by Mark Otto and Jacob Thornton. Bootstrap is free and open-source, with its source code published on GitHub.