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While Photoshop can open many types of files, the native file format, PSD, offers the benefit of preserving all information about layers and pixels, which are the basic units that make up an image. Understanding the role of pixels will help you make decisions about the size and resolution of your image, based on how you plan to use it; a lower resolution is for screen use, higher resolution is best for printing; learn how to use image size and resolution settings and resampling to size your image correctly.