A testimonial, or review, is a recommendation or opinion expressed by a customer or user about a product, service, or company. Frequently used in marketing, it aims to strengthen a brand’s credibility and inspire confidence in potential customers. These testimonials can be real or fictional and are used in both B2C and B2B contexts, where they serve as endorsements or guarantees. They often appear in sales or advertising materials to promote an offer or reassure customers about a new product or service.