TrueType is one of the formats for font files, alongside PostScript and OpenType formats.

HISTORY

TrueType format has been originally created by Apple in the early 1990s for Mac OS and Windows. It was developed after Adobe’s PostScript fonts.
TrueType uses quadratic Bézier curves, which were historically faster to calculate and render than PostScript’s cubic curves. Unlike PostScript fonts—which often required multiple files—installing a single TrueType font is enough to use it.

Opentype-TrueType (OTF-TTF) TrueType outlines can also be packaged inside an OpenType container, allowing them to use OpenType features while retaining quadratic outlines. Files using this container still use the “.ttf” extension. PostScript outlines in OpenType containers use “.otf.”