Rails is one the most popular Ruby frameworks which is currently at its peak, both in terms of demand and technology trend. With more than 3,100 members contributing to its development, and tens of thousands of applications already built using it, Rails has created a standard for every other framework in the Web today.

Rails was initially developed by David Heinemeier Hansson in 2003 to ease his own development process in Ruby. Later, he became generous enough to release Rails to the open source community. Today, it is popularly known as Ruby on Rails.

Rails shortens the development life cycle by moving the focus from reinventing the wheel to innovating new features. It is based on the convention of the configurations principle, which means that if you follow the Rails conventions, you would end up writing much less code than you would otherwise write.

Bootstrap, on the other hand, is one of the most popular frontend development frameworks. It was initially developed at Twitter for some of its internal projects. It makes the life of a novice web developer easier by providing most of the reusable components that are already built and are ready to use. Bootstrap can be easily integrated with a Rails development environment through various methods. We can directly use the .css files provided by the framework, or can extend it through its Sass version and let Rails compile it.

Bootstrap also provides various JavaScript components that can be used by those who don't have any real JavaScript knowledge. These components are required in almost every modern website being built today.

Bootstrap with Rails is a deadly combination. You can build applications faster and invest more time to think about functionality, rather than rewrite codes.