This command is used to draw what are known as polylines. Individual segments can even have tapering thickness. Thick segments are bevelled at intersection points. Polylines can be closed to form a polygon. To construct a polyline, simply follow the prompts.
Most options are quite clear.
Polylines are very important in AutoCAD because they are treated as single entities for many operations. For example, a single command can be used to fillet each corner of a polyline or to form a smooth curve from a polyline. Further, the area and perimeter of a polyline can be also calculated. Finally, polylines can be exploded into separate line and arc entities when necessary. This command is used to draw a regular polygon.