Teletubbies is a British children's television series that first aired in 1997, featuring four colourful characters living in Teletubbieland. Eh Oh became their trademark hello, used whenever they meet, wake up or welcome a visitor, and it quickly stuck in the minds of young viewers around the world. Clips of the greeting later spread on YouTube and social media as a shorthand for innocence and nostalgia, and editors still reuse it today because it is instantly recognisable even without any visual context.