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You designed a 3D model and need to print it. The file you export is an STL. Every 3D printer slicer — Cura, PrusaSlicer, BambuStudio, all of them — accepts STL as input. It's been the universal language of 3D printing since the technology was invented.
STL describes a 3D object's surface as a mesh of triangles. Nothing else. No colour, no texture, no material information, no units, just geometry. This extreme simplicity is both its strength (everything supports it) and its limitation (it can't describe anything beyond shape). The format dates back to 1987 and stereolithography — the original 3D printing technology. The newer 3MF format supports colour, materials, metadata, and multiple objects in a single file, and the industry is slowly adopting it. But STL's dominance shows no signs of fading.
Cura (free), PrusaSlicer (free), and BambuStudio (free) all open STL for print preparation. Blender (free) opens and edits STL meshes. Windows 3D Viewer displays them. Every CAD program (Fusion 360, SolidWorks, FreeCAD) exports STL. If someone asks you for a 3D-printable file, they mean an STL.