testimonial
US /ˌtes.təˈmoʊ.ni.əl/
UK /ˌtes.təˈmoʊ.ni.əl/
1.
a formal statement testifying to someone's character and qualifications, or to the merits of a product, service, or claim
:
•
The website features several customer testimonials.
•
She received a glowing testimonial from her former employer.