Bootstrap's grid system is a powerful mobile-first flexbox grid that enables the creation of complex layouts. It utilizes a series of containers, rows, and columns to layout and align content responsively across different screen sizes.

How Bootstrap Grid Works

The grid system works within a 12-column format, where developers can use predefined classes or mix and match to create various layouts. Here's a basic example of how the grid system can be used:

In this example, .container is the outermost element that centers your content horizontally. Inside a container, .row serves as a wrapper for columns. Each column within a row is represented by a .col-sm class, which defines the column's behavior on small to extra-large devices.

Responsive Behavior