Vector graphics (smooth or pixelated)

Well one tool that caught my attention was the Pen tool. Then pen tool is a good tool to draw around the edges. I started using it today and I got to learn it pretty quick, that's how easy the pen tool is. The most important thing that caught my attention about the pen tool is that how clean the outline is no matter how far I zoom in. Most importantly on why it's so important about the pen tool is that you can make a sketch and make that sketch more detailed without no pixels showing or a rough outline.