What is the difference between OTF and TTF fonts?
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OpenType fonts let you introduce several features in your fonts that cannot exist in TrueType, like ligatures, variants, small caps, ordinal/tabular numbers and many more.
OpenType allows multiple related faces in a single file (for example, multiple weights, italic, small caps, etc.). TrueType has one face per file.
OpenType supports a compact format for describing glyphs that makes the font definition smaller that TrueType.
OpenType also allows alternate forms for individual glyphs and ligatures (where letter combinations form an alternative presentation). TrueType has a much simpler way to support ligatures and no real support for alternate glyphs.
TTF is an older format created by Apple and Microsoft.
OTF is a newer format created by Adobe and Microsoft that has many more capabilities.
Consider OTF an upgrade to TTF that most people outside of the design world will never use.
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