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You have a font file, and it's an .otf. OpenType was jointly developed by Microsoft and Adobe to unify TrueType and PostScript fonts under one format, and it became the standard for professional typography. If a designer sends you a font, it's probably OTF.
OTF supports the advanced typographic features designers actually care about: ligatures (fi, fl automatically combined), stylistic alternates (multiple versions of the same letter), small caps, swashes, contextual substitutions, and — in variable fonts — a continuous range of weights from a single file. OTF uses cubic Bezier curves for smoother outlines than TrueType's quadratic curves, though the visual difference is negligible at screen resolutions.
Double-click to preview and install on any OS. Every design application (Photoshop, Illustrator, Figma, Affinity) supports OTF natively. FontForge (free) edits OpenType fonts. Glyphs ($299, macOS) is the professional tool for type design. For web use, convert to WOFF2 — it's the same font data in a compressed, web-optimised wrapper.