Seaworthiness means that a ship is suitable for sailing safely on the sea. Just like a car needs to be safe on the road, a ship needs to be safe on the water.
To make sure a ship is seaworthy, many things need to be checked. The ship needs to be strong and sturdy, so it doesn't break apart in rough seas. It also needs to have equipment that works properly, like navigation systems, radios, and lifeboats.
The crew members need to be trained and have the right safety gear, like life jackets and helmets. The ship needs to have enough food, water, and fuel for the journey.
Before a ship goes out to sea, it is inspected by experts who look at everything to make sure it is safe. Once the ship passes the inspection, it can sail on the sea with confidence that it will stay afloat and everybody on board will be safe.