Pen Pal Day is observed worldwide every June 1, celebrating the tradition of exchanging letters with pen pals. This day highlights the enjoyment of corresponding with friends from different countries, often through traditional mail, although email communication is also recognized. The concept of pen pals gained popularity in the 1930s, with the establishment of the Student Letter Exchange in 1936, which helped people find suitable pen pals. Celebrations typically involve writing letters to existing pen pals, using personalized stationery or calligraphy to make the correspondence special. For those without pen pals, it is an opportunity to find one through various online platforms or projects like Postcrossing, which facilitates postcard exchanges. The day was created by Rosie Tholl, who also founded the Illinois Pen Pal Picnic Reunion and co-founded Pen Pals United, a biannual convention for pen pals.