Naval flags are special flags used by ships and navies to communicate important information at sea. Each flag has a specific meaning, and they can be used individually or in combination to convey messages. For example, the International Code of Signals includes flags that represent letters and numbers, allowing vessels to send messages about their status or requests for assistance. In addition to communication, naval flags also serve to identify a ship's nationality and rank. The national flag is flown to show the country a ship belongs to, while other flags indicate the ship's type and mission. These visual signals are crucial for safety and coordination among vessels on the water.