Sea vessels, also known as watercraft or boats, come in a wide variety of types, each designed for specific purposes and activities on water bodies such as oceans, seas, rivers, and lakes. Here are some common types of sea vessels:

1. **Fishing Boats:** Fishing boats are used for catching fish and other aquatic animals. They range from small dinghies to large trawlers and fishing vessels equipped with specialized gear.

2. **Cargo Ships:** Cargo ships are designed to transport goods and materials across oceans and seas. They come in various sizes, including container ships, bulk carriers, and general cargo ships.

3. **Container Ships:** Container ships are designed to carry standardized cargo containers, making loading and unloading more efficient.

4. **Tankers:** Tankers are used to transport liquid cargoes such as oil, chemicals, and liquefied natural gas (LNG).

5. **Passenger Ships:** Passenger ships are designed to carry people on various types of journeys, from cruises to ferry services.

6. **Cruise Ships:** Cruise ships provide luxurious accommodations, entertainment, and leisure activities for passengers on extended voyages.

7. **Ferries:** Ferries are used to transport people, vehicles, and goods between ports and across water bodies.

8. **Yachts:** Yachts are privately owned vessels used for recreation and pleasure cruising. They vary in size from small sailboats to large motor yachts.

9. **Sailboats:** Sailboats are propelled by sails and wind power. They come in various configurations, including dinghies, catamarans, and larger sailing vessels.

10. **Naval Vessels:** Naval vessels include warships and submarines used by naval forces for defense, surveillance, and combat.

11. **Research Vessels:** Research vessels are equipped for scientific exploration and data collection in marine environments.

12. **Tugboats:** Tugboats are small, powerful vessels used for towing larger ships, assisting in docking, and other tasks.

13. **Pleasure Crafts:** Pleasure crafts include a wide range of recreational boats, such as jet skis, canoes, kayaks, and paddleboards.

14. **Lifeboats and Rescue Boats:** These vessels are designed for rescue and evacuation purposes in emergencies.

15. **Dredgers:** Dredgers are used to remove sediments and debris from waterways, harbors, and ports to maintain navigable channels.

16. **Submarines:** Submarines are underwater vessels capable of operating below the surface for extended periods. They have military and research applications.

17. **Hovercraft:** Hovercraft are vehicles that can travel on water and land while supported by a cushion of air.

18. **Offshore Platforms:** Offshore platforms, such as oil rigs, are structures used for drilling and extracting oil and natural gas from beneath the seabed.

19. **Research Submersibles:** Research submersibles are small, submersible vessels used for exploring the depths of the ocean for scientific research.

20. **Icebreakers:** Icebreakers are designed to navigate through ice-covered waters by breaking and clearing ice to create passage.

These are just a few examples of sea vessels, each with its own unique characteristics and purposes. The diversity of sea vessels reflects the wide range of human activities that take place on the world's water bodies.