Sunlight was light given off by a star. The term was most often used to describe light from a planet's sun.
Plants made oxygen from sunlight, which made it possible for life to exist on Earth. (AUDIO: Exploration Earth)
The Sun's light was ultraviolet in nature, and repelled Saturnyns. (TV: The Vampires of Venice)
As part of a ruse to lure the Thals into their city on Skaro, the Daleks claimed to be able to grow vegetables using artificial sunlight. (TV: The Daleks)
In 2018, Ramón Salamander used his sun store technology which guided sunlight to help crops grow, thus helping people get more food. (TV: The Enemy of the World)
The planet Midnight orbited a sun which gave off X-tonic rays. (TV: Midnight)