Image tracing is a technique used to convert a raster image, such as a photograph or a scanned drawing, into a vector image. Vector images are made up of paths, which are defined by mathematical equations. This makes them infinitely scalable, meaning that they can be enlarged or reduced without losing any quality.
There are many different ways to trace an image in Photoshop. One common method is to use the Pen tool to manually create paths around the edges of the image. Another method is to use the Image Trace feature, which automatically generates paths based on the colors and shapes in the image.