Snorkel is a piece of tube that you put in your mouth and extends to the surface of the water which helps you breathe underwater. It cuts out the need for you to take your head out of the water and lets you swim nimbly as possible to avoid scaring schools of beautiful fish.
The snorkel is made-up of a mouthpiece designed using a flexible material which is attached to a tube, through which you will inhale air. The snorkel tube's barrel diameter will vary depending on if you're adults or a child as children and adults need to consume different amounts of air to breathe normally.