The Selection Brush is a tool commonly found in graphic design and photo editing software, such as Adobe Photoshop. It allows users to easily select specific areas of an image by painting over them. The brush can be adjusted in size and hardness, making it versatile for selecting both large and intricate details. When using the Selection Brush, users can refine their selections by adding or subtracting areas. This feature is particularly useful for isolating subjects or objects within a photo, enabling precise edits or adjustments. Overall, the Selection Brush enhances the editing process by providing a user-friendly way to create accurate selections.