A sea monster is a creature that is said to live in the ocean and often can scare people because it is so big and unknown. Some people believe that sea monsters are real and others think they are just stories.
Imagine you are at the beach and looking out at the ocean. You might see waves and some boats on the water, maybe even a few dolphins or whales if you're lucky. But some people believe that there could be scary creatures in the ocean that we don't even know about yet.
Some stories say that sea monsters might look like giant octopuses or squids, with many long arms and big eyes. Others say that sea monsters could be like enormous sharks or even some sort of dinosaur that somehow survived underwater.
Even though many people might not believe sea monsters are real, we can still enjoy stories and legends about them. And who knows, maybe one day we'll discover a new creature in the ocean that's even bigger and cooler than we imagined!