Contemporary art means the art of our own time. Most people use the term for art made from about the 1970s to today. It has no single style. Artists work with many media, ideas and cultural traditions from around the world.
Photography became central to contemporary art from the 1970s, through conceptual art and postmodernism. Artists such as Cindy Sherman used photography to question identity and the media. Later, large color prints by artists such as Andreas Gursky entered major museums. Today photography is shown and collected alongside painting and sculpture.
Do you have a better definition? Share it in the comments.