The significance of the orange color in the annual King's Day in the Netherlands relates to the Dutch royal family, the House of Orange-Nassau. Celebrated on April 27th, King's Day marks the birthday of King Willem-Alexander. The entire nation dresses in orange, transforming cities into a vibrant sea of color. This tradition fosters national pride and unity, as people of all ages come together for festivities, street markets, and concerts. The color orange symbolizes the historical and cultural connection to the monarchy.