TTF(TrueType Font) is a font file format jointly launched by Apple and Microsoft. With the popularity of windows, TTF has become the most commonly used font file representation.

OTF(OpenType font) is an upgraded version of TTF, while OTF is a more advanced font, which uses PostScript curves and supports the advanced functions of OpenType.

The full name of TTC is TrueType Collection, which is a TrueType font integration file (. TTC file). It contains multiple fonts in a single file structure to appreciate contour data more effectively. TTC technology can effectively reduce the font file size when multiple fonts share the same stroke.

To put it bluntly, TTC is a font library composed of several TTFs. After installation, you will see more than two fonts in the font list. When most words in two fonts are the same, you can make two fonts into TTC files, which is a common TTC font. Because * * * enjoys stroke data, most fonts in this collection only have different character widths to meet different layout requirements. On the other hand, TTF fonts contain only one font.