What distinguishes a POLYLINE from a LINE in AutoCAD?

A POLYLINE is distinct from a LINE in that it can consist of multiple connected line segments, effectively functioning as a single, continuous entity. This characteristic allows POLYLINEs to create complex shapes with a series of segments that maintain connection and continuity, which can include both straight and curved segments in a single object.

In contrast, a LINE is a singular entity that represents just one straight segment between two points. While multiple lines can be drawn in succession to form a shape, each LINE remains an independent object, lacking the connectivity features that define a POLYLINE.

This difference in structure explains why POLYLINEs are favored for more complex drawings and designs where multiple segments need to work together seamlessly, supporting various geometric configurations. The increased functionality of POLYLINEs also includes the ability to easily edit segments, apply different widths, or convert to arcs, making them a versatile choice for many drafting scenarios.