In an app I am looking at there are fonts in the assets folder of an Angular application.

There will be a .eot, a .svg, a .ttf, and a .woff file for each font. I do not understand what is going on yet. .ttf is for TrueType font, a 1980s Microsoft format, EOT is Embedded Open Type, and WOFF is Web Open Font Format. OTF, not here, is for OpenType.