What is Bootstrap?
Bootstrap is a free front-end framework for faster and easier web development
Bootstrap includes HTML and CSS based design templates for typography, forms, buttons,
tables, navigation, modals, image carousels and many other, as well as optional JavaScript
plugins. Bootstrap also gives you the ability to easily create responsive designs.
What is Responsive Web Design?
Responsive web design is about creating web sites which automatically adjust themselves to
look good on all devices, from small phones to large desktops.
Each Bootstrap component consists of an HTML structure, CSS declarations, and in some
cases accompanying JavaScript code.
Grid system and responsive design comes standard with an 1170 pixel wide grid layout.
Alternatively, the developer can use a variable-width layout. For both cases, the toolkit
has four variations to make use of different resolutions and types of devices: mobile
phones, portrait and landscape, tablets and PCs with low and high resolution. Each
variation adjusts the width of the columns.