Sales promotion consists of a collection of incentive tools designed to stimulate quicker or greater purchase of products and services. It includes consumer promotion, trade promotion, and sales-force promotion. The objectives are to stimulate trial, repeat, and larger purchases. Tools include samples, premiums, contests, point-of-purchase displays, coupons, refunds, bonus packs, free trials, trade fairs, sponsorships, after-sales service, and frequency programs. Sales promotion is a key part of marketing campaigns but overuse can erode brand loyalty if not used judiciously.