- Has good predefined theme and you can override theme.
- Has useful GUI elements like tabs.
- Incorporates most useful styles in classes, that have short names. For example, you don't need add style width: 100%; to element, you can add class w-100.
- Allows to make responsive layout, that will have good looking on mobiles, tablets and desktops. Mobile-first styles are part of the framework.
- Works on all modern browsers.