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You downloaded a font, and it's a .ttf file. TrueType is the font format that Apple and Microsoft developed in the late 1980s as a free alternative to Adobe's expensive PostScript fonts, and it became the default for both operating systems. Most system fonts on Windows and macOS are still TrueType.
TTF contains quadratic Bezier outline data (the mathematical curves that define each letter's shape) plus hinting instructions that optimise how characters look at small sizes on low-resolution screens. This hinting is why the same font can look crisp at 12px on a Windows monitor and subtly different on a Mac — each OS interprets the hints differently. TrueType supports basic typographic features, but OpenType (OTF) extends it with ligatures, stylistic alternates, and variable weights.
Double-click a .ttf file on any OS to preview and install it. FontForge (free) edits TrueType fonts. For web use, wrap TTF in WOFF2 — it's the same data compressed for faster loading. If you're choosing between TTF and OTF for a project, OTF is the more modern option, but TTF works everywhere and the difference matters only if you need advanced typographic features.