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You exported a run, ride, or hike from a fitness app and the file is a .gpx. GPX (GPS Exchange Format) is the universal format for GPS data — a track of latitude, longitude, elevation, and time coordinates that trace your path through the world.
GPX is XML-based and human-readable (open one in a text editor and you can literally read the coordinates). It supports tracks (recorded paths), routes (planned paths), and waypoints (individual points of interest). Every fitness device and app — Garmin, Strava, Komoot, AllTrails, Wahoo — can export GPX. This makes it the interchange format for GPS data, the same way CSV is the interchange format for tabular data.
Google Earth (free) displays GPX tracks on a 3D globe. Strava and Garmin Connect import GPX for analysis. AllTrails and Komoot import GPX for route planning. For quick viewing, online tools like GPS Visualizer display GPX files on a map in your browser. GPX is also used for geotagging photos, planning navigation routes, and sharing trail data.