A photograph was an image recorded by a camera, or the act of recording the image in a technique called photography.
Byulnians were drew power from attention and memories. Because of this, laws were put in place on Byulna that prohibited the use of photographs and anything else capable of recording past moments. (AUDIO: 1963: Fanfare for the Common Men)
Dr Jeremiah O'Kane kept an album with photos of his family, including Daniel and Peter Russell. Liz Shaw had a photo of Alistair Gordon Lethbridge-Stewart on the wall of the P.R.O.B.E. office at Ashley House. (HOMEVID: The Zero Imperative)
Victor Kennedy acquired photographs of Rose Tyler, which he shown to LINDA. One photograph, which also featured the TARDIS, was used by Elton Pope as he searched for Rose, with Mrs Croot leading him to Jackie Tyler. Though Elton and Jackie quickly became friends, Jackie found the photograph of Rose in Elton's coat pocket. Realising that Elton was using her to find the Tenth Doctor, Jackie angrily sent him away. (TV: Love & Monsters)
In Christmas 2017, the Twelfth Doctor discovered Bill Potts had no pictures of her mother. Then, he went back in time and took many photographs of her. When Bill arrived in her flat, her foster mother told her she had found a box full of pictures of Bill's mum. Bill went to her bedroom, and cried while looking at the pictures. (TV: The Pilot)
River Song claimed to have pictures of all the Doctor's incarnations. She showed she had pictures of the first twelve incarnations of the Doctor from his first regeneration cycle. (TV: The Husbands of River Song)