A photo, or photograph, is a visual representation of reality that is captured using a camera or other photographic equipment. It is the result of recording light or other forms of electromagnetic radiation onto a light-sensitive medium, such as a film or a digital sensor. Photos serve as a means of capturing and preserving visual information, documenting people, places, events, objects, and moments in time. They are widely used in fields such as journalism, advertising, and art, due to their ability to accurately depict reality with a high level of detail. Overall, photos are a powerful tool for capturing and communicating visual information, and are an essential part of our modern visual culture.