The Committee for Skeptical Inquiry (CSI) is a group of grown-ups who are really good at asking questions and finding out the truth. They like to use science and critical thinking to investigate things that some people believe in but might not be real, like ghosts or aliens.
Imagine you heard a story about a monster living in your closet. You might believe it at first, but then a grown-up from CSI would come and investigate. They would look in your closet and use special tools to see if there really was a monster. If they didn't find any evidence, they would tell you that it's probably not true and there's no reason to be scared.
CSI members also investigate things like alternative medicine or psychics to see if they are really effective. They want to make sure that people are not being fooled or misled into believing something that might not work or could even be dangerous.
Overall, the Committee for Skeptical Inquiry is like a superhero team that wants to protect people from false ideas and help them understand the truth by using science and critical thinking.