TrueType (TTF) is a character set for fonts. The TTF file format characterizes fonts in outline as vector graphics. TrueType, unlike Postscript, uses quadratic equations to calculate the Bézier curves of each character in the font.
Good TTF fonts consist of many vectors and nodes to neatly describe the outline of a letter. They can be scaled for print output and screen display.
The file format developed by Apple and Microsoft contains general information about the font, the typeface and the coordinates of each character (glyph). Each individual coordinate point is specified with 15 bits each for the vertical and horizontal coordinates. Curves are treated like Bézier curves.