What is a blend file and how do I open a blend file?

BLEND is a data file of a 3D image or animation project created with Blender, an open source 3D modelling program. It contains 3D mesh data, lighting information, vertex painting, animation keyframes, NURBS objects, procedural textures, uvmapping layout, and realtime interactivity data, and may also store multiple scenes in a single file.

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