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You received a DXF file from an engineer, architect, or CNC operator. DXF (Drawing Exchange Format) is the universal translator of the CAD world — Autodesk created it specifically so that CAD drawings could move between applications that otherwise refuse to speak to each other.
DXF is a text-based format (or optionally binary) that describes 2D and 3D geometry using entities like lines, arcs, circles, polylines, and text. It deliberately sacrifices the advanced features of proprietary formats (parametric constraints, assembly relationships, feature trees) in exchange for compatibility. This makes it lossy as an interchange format — you get the geometry but lose the design intent. For simple 2D drawings and CNC toolpaths, that's usually enough.
AutoCAD, LibreCAD (free), FreeCAD (free), and virtually every CAD application reads and writes DXF. Inkscape (free) can import 2D DXF for vector editing. For laser cutting and CNC routing, DXF is often the required input format. If someone asks you for a CAD file and you don't know what software they use, DXF is the safest bet.