Brand credibility refers to the perceived trustworthiness, reliability, and authenticity of a brand in the eyes of consumers. It is built through consistent delivery of promises, quality products or services, transparent communication, and positive customer experiences. For a startup, partnering with established companies can significantly enhance its brand credibility by associating it with trusted and recognized names. This association can help reduce consumer skepticism towards new entrants in the market and accelerate the startup's growth by leveraging the established company's reputation and resources.