Yes, coupon codes and promo codes do expire. Most coupons and promo codes are valid for a few weeks or a few months after their issuance. The exact duration can vary depending on the retailer or the specific promotion. Once the expiration date has passed, the coupon or promo code is no longer valid and cannot be used for a discount. It's important to check the expiration date before trying to use a coupon or promo code to ensure it's still valid.