What is pen tool in photoshop

*What is pen tool in photoshop ?

//Pen tools commonly used to draw path .To draw a curved path using this tool ,select the tool & position it where you want the curve to begin & click.On doing so , the first anchor point appears & the pointer changes . Now place the mouse pointer where you want the curve segment to end. Next click & drag to create a curve . You can keep dragging from different locations to create a series of smooth curves. To close the path , place the mouse pointer over the anchor point from where you started.