Mono What?

Most fonts are proportional but some are monospaced. Proportional fonts allow each letter the proper amount of space whereas with monospaced fonts, sometimes called typewriter fonts, each letter is forced into the same block. An “i” or an “l” looks isolated and a “w” or an “m” looks squished. This makes monospaced fonts unsuited for bodies of text (Gelderman, 1999, p. 96). They should only be used in situations when readability isn’t the main concern.