A testimonial is a written or spoken statement in which a person says they used a product or service and liked it, or that they appreciate someone's work, skill, character, etc. Testimonial is also used as a synonym of evidence and testimony.

// The website is full of testimonials from satisfied customers.

// The book's popularity is a testimonial to its timeliness.

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"To commemorate their successful journey in the sport, the team released a heartfelt tribute video featuring testimonials from team members sharing their fondest memories." — Lydia Mee, Newsweek, 31 Oct. 2024

In 1639, Scottish poet William Drummond responded to the politics of his day with a cheeky set of new laws, including one stipulating that "no man wear a ... periwig, unless he have a testimonial from a town-clerk, that he is either bald, sickly, or asham'd of white hairs." Testimonials take different forms, but always, like in Drummond's facetious law, they provide affirmation or evidence. (Testimonial traces to Latin testimonium, meaning "evidence" or "witness.") In the 19th century, testimonial developed a new use, referring to a tribute—that is, a gift presented as a public expression of appreciation. Today, testimonial is most often used to refer to a statement—such as one posted on any number of websites devoted to consumer reviews—that endorses a product or service.