Nyan Cat rose to internet fame in 2011 when an animated loop of a grey cat with a Pop-Tart body flying through space and trailing a rainbow was set to a catchy Japanese song built around the word nyan, the Japanese sound for a cat's meow. The combination spread rapidly across YouTube and social media, becoming one of the defining memes of the early viral era and inspiring remixes, merchandise and countless parodies. It remains popular because the tune is instantly recognisable, endlessly loopable and tied to a simple image of pure, absurd joy.