
Practical Web Design
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Bootstrap is an open source HTML, CSS, and JS library that helps you build websites and apps very easily. It is a library of components that you can reuse instead of re-creating every component over and over again. Bootstrap is responsive and mobile first; this is essentially what Bootstrap is all about, and why it has become so popular with web developers. Now, let's say the developers are creating different versions of their website for different devices; just by applying small amounts of code to the pages, the sites will be displayed correctly on any device, which saves time and additional cost.
There are major updates every couple of years. Bootstrap 2 was officially released in 2012, then was reasonably quickly replaced with Bootstrap 3, which was released in 2013. Then, of course, there came Bootstrap 4 in 2016. The more stable it becomes, the longer the gaps between the releases. Hopefully, it won't be too long before Bootstrap 5 arrives.
Bootstrap 4 is still very...