A search engine was an algorithm used to find information on a computer network such as the internet.
Raine Creevy used a search engine at Margrave University in 2001 to look up her father and learnt that he had died. (AUDIO: Animal)
Luke Rattigan invented the Fountain Six search engine in 2002. (TV: The Sontaran Stratagem)
VOR was a search engine developed by Daniel Barton in 1991. (TV: Spyfall)