Kerning

Kerning involves closing up type where the letter shape results in uneven letter spacing.

See also kern.

Discussion:
Spacing & Kerning Classes
Kerning Pairs
Brute Force Testing
Kerning List

Technical Discussion:
FontLab 5 font file ignores kerning values
Kerning: Flat AND Class-based?
FL 5 Kerning classes not applying when exported

Additional Articles:
Kern King from Leslie Cabarga
Basic Kerning Test from GarageFonts