There are three types of connector lines to connect objects — straight, elbow (angled), and curved.
After you choose a connector AutoShape (AutoShapes: A group of ready-made shapes that includes basic shapes, such as rectangles and circles, plus a variety of lines and connectors, block arrows, flowchart symbols, stars and banners, and callouts.), blue connector sites appear on objects as you move the mouse pointer over them. These points indicate where you can attach a connector line.
When you rearrange objects that are joined with a connector line, the connectors remain attached to the objects and move with the objects. If you move either end of a connector, that end unlocks or detaches from the object. You can then lock it to another connection site on the same object, or you can lock it to another object. Once the connector locks on a connection site, the connector stays connected to the objects, no matter how you move each object.
After you rearrange connected objects, some connectors might need to be rerouted to make the most direct connections and keep connectors from crossing objects.
Draw a line or connector