When you go to the beach, sometimes there can be very strong water. This is called a "rip current". It's like a really strong river in the ocean. If you accidentally get caught in the rip current, it can be hard to swim back to shore because the water is pulling you out to sea.
Sometimes, the lifeguards will put up a sign or make an announcement that says "rip current statement". This means that there is a strong rip current happening at that time. It's important to listen to these announcements and be careful when swimming or playing in the water.
If you do get caught in a rip current, don't try to swim against it. Instead, try to swim parallel to the shore to get out of it. You can also try waving your arms and calling for help if you need it. The most important thing is to stay calm and stay afloat until help arrives.