Space, usually on a page, that is unmarked is referred to as white space or negative space. It is the space between lines of text, margins, graphics, gutters, columns …
White space is not simple 'blank' or unused space — it is an important element of design that creates balance, rest for the eyes, a frame or backdrop to non-white space. Improper proportion of white space creates a cluttered look that is difficult to read and comprehend.
Proper handling of white space is an essential aspect of aesthetic composition.