Definition:
Kerning is the adjustment of space between pairs of letters to make them more visually appealing. Some type comes with kerning pairs — commonly kerned pairs of letters with the spacing already adjusted for best visual appearance so that manual kerning of headlines and subheads is unnecessary.
Not all software programs can access the kerning pairs found in some fonts. Other programs not only read the built-in kerning information, but can also edit the kerning pairs to change the kerning or add additional kerning pairs.
Examples:
Some commonly kerned pairs include Wa, To, and Ya. Some typefaces may have hundreds of kerning pairs defined.
