A torch was a light source.
In 102, the Eleventh Doctor, Amy Pond and River Song used flaming torches while exploring underhenge. (TV: The Pandorica Opens) In April 1996, Amelia Pond used a torch one night when she went outside to investigate a mysterious police box that crashed into her garden shed at Easter 1996. (TV: The Eleventh Hour) She, the Doctor and River Song and a group of soldiers later used torches when confronting the Weeping Angels. (TV: Flesh and Stone)
On 27 July 2012, the Tenth Doctor carried the Olympic Torch when the original torchbearer fell and used it to light the Olympic Flame. (TV: Fear Her) He also used a torch when stranded with a group of people, (TV: Midnight) when facing the Vashta Nerada, (TV: Silence in the Library) and when walking through an underground entrance to a Cyber factory on an alternate earth with Mrs Moore. (TV: The Age of Steel)