Source: Example of kerning http://en.wikipedia.org/wiki/File:Kerning_EN.svg Example of metal typeset kerning http://en.wikipedia.org/wiki/File:Metal_type_kerning.svg Example of tracking http://www.mmprint.com/blog/2011/typography-kerning-leading-tracking/
More than one line of type.
The space between lines of type, usually measured in points. In computer program settings, the number used is the amount of linespacing added to the size of the type.
Pronounced "ledding", another term for linespacing, refers to the non-digital printing technique of using strips of lead to create the space between lines.
The spacing between letter pairs.
The spacing between letter pairs in a headline, often adjusted to make the white space visually even.
The spacing over a range of letters and words in body copy, often adjusted for fit or style.