What is the purpose of layer styles in Photoshop?

Layer styles in Photoshop are designed specifically to enhance the visual appearance of layers by applying effects that can create depth, dimension, and emphasis. These effects include options such as drop shadows, inner glows, strokes, and bevels, among others. When a layer style is applied, it allows for a non-destructive way to change how a layer looks without permanently altering the original image. This flexibility enables users to experiment with different looks and easily revert any changes or try other styles without any loss of quality.

Other functions mentioned, such as annotating images, changing color modes, or exporting file formats, do not pertain to layer styles. Annotations are generally added using text tools or shapes, while color mode adjustments and export options involve settings that affect the entire image rather than individual layers and their visual effects. Layer styles focus solely on enhancing the attributes of layers to support creative design efforts.