Mail-in sweepstakes are promotional contests where participants enter by sending their entries through the postal service. What are mail-in sweepstakes? They typically require individuals to submit a completed entry form, often found in advertisements or online, along with any necessary information. These sweepstakes offer a chance to win prizes ranging from cash to products, and they are popular because they allow participants to enter without needing to make a purchase. Understanding what are mail-in sweepstakes can help individuals take advantage of these opportunities while ensuring they follow the rules for entry.