The Pen Tool is very useful when you want to make an advertisement , you can even draw an image with it. As you can see I made a Straight line, a Curve; you could even write on the lines and it looks pretty cool. And I also used the shape tool as you can see the red circle you can write in OR outside the circle. You make the stroke invisible and you wouldn't a line, which makes it look better and it would only be the text. you would have a straight text, a curvy text and a shape text. now you have another way to create an image/thing/object with the pen and shape tool.
