To delete an anchor point on a path, click on it with the Curvature tool and press the delete key on your keyboard. To add an anchor point on existing path, click on the path with the Curvature tool to add the anchor point at that position. With Curvature tool selected, adjust anchor points on a path by clicking and dragging to reposition them. To create a straight path, double-click to set a Corner Point, or position the pointer over the point on already drawn a point that has a curve and double-click to convert it to a corner point. To draw an open path, hold down the Command (Ctrl) key and click anywhere on the Artboard to deselect the object. To close the path, position the pointer over the original point you created, and click when a circle appears next to the pointer icon.Now pointer movement affects the shape of the curve between the two points.

Again move the pointer away from the second point just created above.To do so, set your first curve with the pen tool as described above. Move the pointer away from the point you created above and click again to set the next point. You can control curves while you are drawing, too.Click once to set a starting point for the curved path.Asterisk indicates that you’re about to draw a new path. With Curvature tool selected, asterisk appears next to the tool icon when pointer is moved into Artboard. Below figure shows the Curvature Tool in Tools Panel. This tool creates same types of paths as that the Pen tool creates-both curved and straight-but without having to fuss with direction handles. Curvature tool simplify drawing paths with precision.

Curvature Tool and Pen tool essentially does the same thing-creating paths with as much precision as you need.

Adobe illustrator with curuture tool