A bong is a type of smoking device used to inhale smoke from dry herbs or tobacco. It consists of a bowl to hold the substance, a stem to draw smoke through, and a water chamber to cool and filter the smoke before it reaches the user's lungs. Bongs can come in many different shapes and sizes, from simple glass tubes to elaborate, multi-chambered contraptions.

 

https://www.wfwpipe.com/blogs/tips/what-is-a-bong-and-how-to-use-it