A butt plug is a type of toy that you can put inside your butt. It usually looks like a cone shape, with a base at the bottom and a narrower tip at the top. It's made of materials that are safe to go inside your body, like silicone, metal, or glass. People use them because they can feel good when you insert and remove them, move them around, and keep them in your butt. Some people feel pleasure from it because of their nerves. You should always use a lot of lube when you use a butt plug and make sure it's the right size for you.