RGBA color values are an extension of RGB that includes an alpha channel to control transparency. The format uses four components: Red, Green, Blue, and Alpha. Each color component (R, G, B) ranges from 0 to 255, while the alpha value ranges from 0 (fully transparent) to 1 (fully opaque). This allows you to create see-through colors for overlays, buttons, backgrounds, and more. RGBA is commonly used in web design for layering effects and improving visual depth. It enhances the flexibility of styling elements compared to plain RGB.