Final answer:
A user who has established credibility in a specific industry or content area is someone who has demonstrated expertise and authority in that field through their credentials, knowledge, and experience.
Step-by-step explanation:
A user who has established credibility in a specific industry or content area is someone who has demonstrated expertise and authority in that field. This can be achieved through various means such as education, job experience, research, and community involvement. By showcasing their credentials, knowledge, and experience, they are able to gain the trust and confidence of others in their industry or content area.