Leading

Leading is defined as the distance between the baselines of successive lines of type. For example, if a font style declares a 10 point font size with a 10 point font leading, then successive baselines will be 10 points apart. With a 12 point font leading, the baselines will be 12 points apart. If additional vertical space is inserted between paragraphs, the distance between successive baselines is equal to the size of the inter-paragraph space plus the current font leading.