Selective focus is a photography technique that emphasizes a specific subject while blurring the background and foreground. This effect draws the viewer's attention to the main subject, making it stand out. It is often used in portrait photography to highlight the person being photographed, creating a more intimate and engaging image. This technique can be achieved using a wide aperture setting on a camera lens, such as those found in DSLR or mirrorless cameras. By controlling the depth of field, photographers can create a pleasing separation between the subject and its surroundings, enhancing the overall composition of the photograph.