Photojournalism is the combination of photography and journalism to visually tell a news story. The history of photojournalism spans over 150 years from early war photography to the development of digital technology and citizen journalism. Effective photojournalism requires strong contacts, adherence to editorial values like accuracy and fairness, and understanding assignments from editors. It also relies on skills like developing story ideas, understanding news value, writing captions, mastering photo technology, and using composition techniques.