Photography is defined as drawing with light or working with light and film. It involves combining the Greek words "photo" meaning light and "graphy" meaning drawing or writing. There are different styles of photography including art photography which expresses ideas or concepts, documentary which objectively documents subjects, commercial which includes paid work like weddings or advertising, and other non-commercial uses in fields like science. Photography can be created digitally, through traditional film, or as videos which are moving photographs captured at 24 frames per second. Examples provided are landscape artist Ansel Adams, documentary photographer Dorothea Lange who did not coach subjects, and commercial/paid photography work or advertisements. Non-commercial scientific uses are also mentioned like X