In 3D modeling, edges are the linear connections between two vertices (corner points) that define the structure and outline of a 3D object, forming the boundaries of its faces (flat or curved surfaces).
They act as a framework for shaping—editing edges (like extruding to add depth or beveling to smooth corners) lets designers adjust detail or fix sharp areas.
For beginners, use edge tools in software like Blender to modify a simple cube (e.g., rounding corners) to see how edges directly impact a model’s structure.