What is the Intertidal zone?

What is the intertidal zone you ask? What is it? Well, the intertidal zone is one of the harshest creature habitats on Earth. Now, why is it so harsh. I have a theory: 6 hours later, high tide becomes low tide. That is my theory. Now, after this, I am going to tell you where the four intertidal zones are located. So, I'll see you there.