Simple Definition:

Credentials refer to the documents or proof that confirm a person’s qualifications, achievements, or identity. They are used to establish someone’s credibility or trustworthiness in a particular field or situation. Credentials can include degrees, certifications, licenses, or identification cards. For example, a doctor may have credentials such as a medical degree, a license to practice medicine, and a membership card from a professional medical association.

Very Simple Definition:

Credentials are documents or proof that show someone is qualified or trustworthy. For example, a doctor’s credentials might include a medical degree and a license.