When we use the term “credentials” we are referring to some sort of qualification or achievement about an individual that would indicate, who they are, their citizenship or even their suitability for a job role. It is a catalogue of information that some authority says to be true about you.
For example, if you have graduated from a university, then the university (issuer) will supply you (holder) with a verified credential for the the degree in which you completed. This will hold information on the date you completed and with which grade you passed by. This credential can then be shared with a potential employee (verifier) to gain confidence that you are qualified for the job role.