IMDb stands for the Internet Movie Database. It's like a really big book with information about movies, TV shows, actors, directors and everything related to the entertainment industry. If you're wondering about a movie or TV show, you can look it up on IMDb and find out who directed it, who acted in it, when it was made, what it's about, and other cool stuff like trivia and ratings. People use it to find out which movies are good, which ones to watch, and which actors or actresses are in them. IMDb is a great place to learn more about your favorite movies and TV shows, and discover new ones too!