Flag signals are a method of communication using flags to convey messages, especially in maritime contexts. Different combinations of colored flags represent specific meanings, allowing ships to communicate important information, such as their intentions or requests for assistance, without the need for radio or verbal communication. This system is often referred to as International Code of Signals, which includes a set of flags and their meanings. Each flag corresponds to a letter of the alphabet, and by combining flags, vessels can send complex messages over long distances, ensuring safety and coordination at sea.