A naval fleet is a group of ships and submarines organized for military operations at sea. These fleets are typically part of a country's navy and can include various types of vessels, such as aircraft carriers, destroyers, and support ships. The primary purpose of a naval fleet is to protect national interests, conduct maritime operations, and ensure security in international waters. Naval fleets can also participate in humanitarian missions, disaster relief, and joint exercises with allied nations. They are essential for maintaining a country's presence on the seas and can be deployed for various missions, including anti-piracy, peacekeeping, and search and rescue operations.