Giving a priority to specific elements or content is one of the most common tasks for designers. While designers can use many visual methods to spotlight specific elements, one way to achieve good results is to play with the amount of whitespace around the focal points.
There’s a relationship between a distance and attention — larger distance forces attention — the lack of other elements makes existing elements stand out more. Designers can use this property of whitespace to highlight important elements. Extra padding around a particular segment of content forces user’s attention onto that area simply because there’s nothing else on the screen to draw attention.
The more whitespace there is around an object, the more the eye is drawn to it.
Google, as you can in the example below, is a big advocate of whitespace in their designs. Whitespace helps communicate the intent of this design in a glance: the focus is put on the main aim of the page, without massive dedication to other areas.