Communication through fire in olden days?

In ancient times, communication through fire was primarily achieved using signal fires or smoke signals. Mesolithic and later cultures would light large fires on elevated ground to convey messages over long distances, with the size, color, and duration of the flames or smoke indicating specific meanings. This method was particularly effective for alerting nearby communities about dangers, such as approaching enemies or natural disasters. Additionally, cultures like the Native Americans and ancient Greeks developed intricate systems of smoke signals that allowed for relatively complex messages to be transmitted quickly across vast landscapes.