Not sure if everyone already knows this but I thought I’d share anyways. I’ve been looking into buying fonts and came across this the other day: when downloading a font, do I want OTF (OpenType Font) or TTF (TrueType Font)?
In short: TTF came first, and was created for use on multiple platforms (Windows, Mac, print, web, etc). OTF was created afterwards and offers a bit more (ligatures, glyphs, storage, small caps, etc).
Here’s a link that breaks down the difference in more detail. Hope this is helpful!