Celebrity testimonials are endorsements or recommendations made by famous individuals about a product, service, or brand. These testimonials often leverage the celebrity's popularity and credibility to influence public opinion and encourage consumers to make a purchase. Brands frequently use these endorsements in advertisements to reach a wider audience. The effectiveness of celebrity testimonials can vary based on the celebrity's relevance to the product. For example, a fitness celebrity endorsing a health supplement may resonate more with consumers than a movie star promoting the same product. Ultimately, the goal is to create a positive association between the celebrity and the brand.