They are often featured in Adobe Photoshop tutorials to teach beginners how to manage complex layers, fonts, and document dimensions (typically 3.375 x 2.125 inches).
If you need a realistic scan for UI testing, scan your own NID, then in Photoshop: bd nid psd file
PSD stands for . It is the native file format for Adobe Photoshop. Unlike a flat JPEG or PNG image, a PSD file preserves multiple layers. This allows designers to edit specific parts of an image—such as text, colors, or photographs—without affecting the rest of the design. They are often featured in Adobe Photoshop tutorials