Thanksgiving is a national holiday celebrated primarily in the United States and Canada. It is observed on the fourth Thursday of November in the U.S. and on the second Monday of October in Canada. The holiday originated as a harvest festival, where people gave thanks for the food and blessings of the past year. Traditionally, families gather for a large meal that often includes turkey, stuffing, mashed potatoes, and pumpkin pie. Many people also take time to reflect on what they are grateful for and may participate in community service or charitable activities during this time.