This shortcode option gives you the ability to layout a page in a multitude of ways. In addition to the standard desktop layout these columns are fully responsive. The grid adapts to be 724px and 1170px wide depending on your viewport. Below 767px viewports, the columns become fluid and stack vertically.
Also included is another shortcode to add columns inside of columns. Here are just a few examples, there are a lot of variations not included here.
How to access: Click [R] for the Shortcode Editor > Select Columns > Select Options to Customize.