National Best Friends Day is celebrated on June 8th every year in the United States. The origin of this unofficial holiday is not clear, but it is believed to have been created as a way to encourage people to appreciate and show gratitude to their best friends. The specific choice of June 8 is likely arbitrary, as similar 'day of recognition' holidays are often placed on random calendar dates. While the origin and choice of June 8 remain somewhat vague, the day has become an annual tradition for celebrating the special bond shared with best friends.