This is an image of what cel animation looks like before it goes on TV. It shows the background plate and a cel with Bugs Bunny on it.
This is a video of Looney Tunes. Looney Tunes was made by using the traditional 2D animation technique which is cel animation.
This is a video of Wacky Races which was made by doing cel animation.
This is a video of The Lion King 1 1/2. This is a cel animation.