A few types have a portion of the face letter projecting over the body, as in the letter f ; this projection is called the kern, and in combination with other letters the projecting part generally extends over the next letter, as in fe. In those combinations, wherein the kern would come in contact with another letter, compound types are cast, as in the case of ff, fi, fl, ffi, ffl.
Source: wiktionary
If you need to kern anything beyond the most commonly used pairs, you can use applications software such as Adobe PageMaker to customize pairs.
Source: wiktionary
Especially consider kerning if you are printing on a relatively high-resolution printer, such as a 600-dpi (dots per inch) laser printer.
Source: wiktionary
Remember, the goal of kerning is to make letter pairs look natural, not necessarily to minimize letterspaces.
Source: wiktionary
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