What exactly is the board certificate of American doctors? Would you please explain?

Certificate in professional field. Refers to the certificates issued by professional medical associations or committees in some medical fields to doctors to prove their outstanding talents in a certain field. For example, the American Professional Psychology Committee awarded a Committee certificate to a psychologist, which means that they recognized the doctor's outstanding ability in the field of psychotherapy.

Board certificate is different from the qualification certificate of ordinary doctors. The doctor's qualification certificate only proves that he is qualified to be a doctor. With the board certificate, doctors are already experts in a certain field.

Some large medical institutions in the United States will require doctors to have certificates in this field when recruiting attending doctors in a certain department.