In simple terms, a responsive web design figures out what resolution of device it's being served on. Flexible grids then size correctly to fit the screen. Mobile-first Bootstrap 3 is responsive.
The new Bootstrap 3 is a smaller build. The separate Bootstrap base and responsive.css files have now been merged into one. There is no more fixed grid, only fluid.
The new fluid grid comes in 3 flavors, or actually sizes. The large grid
col-lg-* works exactly like the Bootstrap 2.x
There is also a small grid that is realized using the
col-sm-* classes. This smaller grid is ideal for smartphones and tablets.
Finally, there is the non-stacking tiny grid
col-* that is intended for very small screens less that 480px.
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