The purpose of creating a Red and Green Christmas Poster is to promote the festive season and attract attention from potential customers. The poster aims to showcase the Christmas spirit through its use of traditional holiday colors and imagery, including Christmas trees, snowflakes, and gift boxes. By using a visually appealing design, the goal is to encourage people to visit stores, restaurants, or events during the festive period. The poster also serves as a reminder to the audience to spread love, joy, and happiness during this special time of year.