A snorkel is a tube that you can breathe through when you are swimming with your face in the water.
A snorkel can make people think of fun times at the beach or in the ocean.
Examples:
I use a snorkel to breathe when I swim.
She bought a new snorkel for her vacation.
The snorkel helps me breathe in the water.
I can't find my snorkel anywhere!
With a snorkel, you can breathe like a fish!
I saw a big fish while I was using my snorkel.