What is a catchy phrase used to promote a product or brand?

A catchy phrase used to promote a product or brand is best described as a slogan. A slogan serves as a memorable, succinct way to communicate the essence of a brand or product, aiming to capture attention and leave a lasting impression in the minds of consumers. It typically reflects the brand's values, goals, or unique selling propositions, directly appealing to the target audience.

While terms like jingle and tagline may also be associated with advertising, they have specific connotations. A jingle is typically a short, catchy piece of music designed to be memorable, often used in conjunction with a slogan. A tagline, though similar to a slogan, is often more focused on the brand's overall identity rather than a specific product promotion. The term catchphrase can refer to any phrase that becomes popular or is widely recognized, but it lacks the focused intent of a slogan in advertising contexts. Therefore, the designation of a slogan is the most accurate in this scenario for a promotional phrase.