A certificate is a formal document providing evidence of a fact or claim.
For example, a certificate of deposit, a certificate of insurance, or a certificate issued on the award of a professional qualification.
A Certificate is a level of educational qualification.
For example, the Association of Corporate Treasurers' Certificate in Treasury (CertT) and Certificate in Treasury Fundamentals (CertTF).
In this context, a Certificate ranks above an Award, but below a Diploma.