Image tracing is the process of converting a raster image into a vector image. Raster images are made up of pixels, while vector images are made up of paths. Paths are defined by mathematical equations, which makes them infinitely scalable. This means that vector images can be resized without losing any quality.
Tracing an image in Photoshop can be a useful technique for a variety of purposes. For example, you can use image tracing to: