Paths are vector-based (line) drawings. This means that you can stretch and re-shape a path and it will not lose detail. Compare this with a standard raster image such as a photograph, which will become blocky when it's stretched, and will lose detail when it's reduced in size.
Paths are really useful. Once you've got the hang of using the Pen tool and the other path tools, you can create really complex freehand shapes such as symbols, drawings and icons. You can then turn these shapes into raster images at any resolution!
Paths are also great for selecting irregular objects. Because you can easily edit the shape of a path after it's created, you can fine-tune it to exactly match an irregular border. Much better than messing about with the lasso tools!
Photoshop comes with a range of cool shapes that you can create, using the Shape tool. These shapes are also paths. However, once you learn how to use the path tools, you'll be able to play with and modify these built-in shapes, as well as create your own shapes from scratch.
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