The adjustment of space between certain characters in a line of text, using their natural space & slope to improve appearance.
However, Kerning.js not only helpful in allowing you to adjust space, but alter color, size, pairings and other elements of your type, too.
CSS, meet kerning. Kerning, meet CSS. Kern, style, transform, and scale your web type with real CSS rules, automatically.
Kerning.js is a single script, small, and has no dependencies. Add it to your page, add some CSS rules, and your text will be beautified.
You can view & use Kerning.js by following the link here