Paparazzi are people who take pictures of famous people, like actors, singers or athletes, when they're out in public, doing things like going to the grocery store or going for a walk.
It's like taking a picture of your friend at the park, but instead of your friend, it's someone famous.
Some people think it's okay to do this because famous people are in the public eye all the time, but others think it's not okay because it can be invasive and make the famous person feel uncomfortable.
It's important to remember that famous people are still people and deserve to have their privacy respected, just like you and me.