Vignetting is a photographic effect where the corners of an image appear darker than the center. This can happen naturally due to lens design or can be intentionally added during editing. It often draws attention to the main subject by creating a subtle frame around it. There are two main types of vignetting: optical vignetting, which occurs because of the lens's physical characteristics, and post-processing vignetting, which is applied using software like Adobe Photoshop. Photographers use vignetting to enhance the mood of a photo or to guide the viewer's eye toward the focal point.