A concave mirror is a curved mirror that bulges inward, resembling a bowl. It reflects light rays that hit its surface, causing them to converge or focus at a point known as the focal point. This property makes concave mirrors useful in various applications, such as in telescopes and makeup mirrors, where magnification is desired. These mirrors are commonly made of glass or plastic with a reflective coating. When an object is placed close to a concave mirror, it produces a virtual image that appears larger and upright. This characteristic is beneficial in devices like shaving mirrors and dental mirrors, enhancing visibility for detailed tasks.