A crocodile clip is a small clamp with two jaws that can open and close like a little mouth. It's called a crocodile clip because the jaws look a bit like the jaws of a crocodile! These clips are often used in science experiments or when working with electronics.
Imagine you're playing with some wires. You want to connect them to a battery to make a light turn on. But holding the wires against the battery with your fingers is tricky, and you might get a shock! That's where the crocodile clip comes in. You can clip one end of the wire to the crocodile clip's jaw, and then clip the other end to the battery. The clip holds the wire in place so you don't have to hold it yourself.
Some crocodile clips have little springs inside the jaws to help them open and close. Others might have plastic insulation to protect you from any electricity running through the wire. They come in all different colors and sizes, but they all work in the same way. Just open them up, clip them onto something, and then close them down to hold it in place. Easy peasy!