King's Birthday is a public holiday celebrated in several countries to honor the birthday of a reigning monarch. The date varies depending on the country and the specific monarch. For example, in Thailand, it is celebrated on July 28 for King Bhumibol Adulyadej, while in Netherlands, it falls on April 27 for King Willem-Alexander. On this day, various festivities take place, including parades, concerts, and fireworks. People often wear the national colors and participate in community events. It is a time for citizens to express their loyalty and appreciation for their monarch and the royal family.