Americans celebrate Valentine's Day on February 14th to honor St. Valentine and express love to others. It has become a popular holiday in the US focused on exchanging gifts like cards, flowers, chocolates, and candies between loved ones. The tradition of gift-giving became common in the mid-20th century. Valentine's Day is also commercialized and is estimated to be the biggest card and gift-giving holiday in the US. Schools often hold celebrations where children perform and gift cards and handmade items to their friends and teachers.