World Post day happens each year on October 9, the anniversary of the Universal Postal Union (UPU), which started in 1874 in Switzerland. The UPU was the start of the global communications revolution, introducing the ability to write to others all over the world. World Post Day started in 1969. Since then, countries all over the world take part in celebrations to highlight the importance of the postal service. Many things happen on this day. Post offices in some countries hold special stamp collection exhibitions; there are open days at postal measures and there are workshops on postal history. The UPU organises an international letter writing competition for young people.