The 'Today I Learned' (TIL) concept originated on Reddit as a subreddit dedicated to sharing interesting and obscure facts. While it started as a text-based community, it quickly evolved into a meme format where users combine the TIL acronym with surprising trivia or personal epiphanies, often paired with reaction images. The format serves as a digital 'did you know' card, allowing people to spread knowledge or humorously admit their late-to-the-party realizations about life. It has become a staple of internet culture, bridging the gap between education and entertainment through the sharing of bitesize information.