Definition
An official credential issued by the FAA that establishes a pilot's qualifications. A pilot certificate identifies the level of pilot privileges the holder has earned (such as Student, Sport, Recreational, Private, Commercial, or Airline Transport Pilot). A rating is an authorization placed on that certificate that adds specific privileges, such as the category and class of aircraft the pilot may fly (airplane single-engine land, rotorcraft helicopter, etc.) or the type of operation permitted (instrument, multiengine, type rating for a specific aircraft).
Plain English
A pilot certificate is the document that says what kind of pilot you are. A rating is an add-on to that certificate that says what you're allowed to fly or how you're allowed to fly it.
Context Anchor
Seen in FAA rules, pilot applications, logbook endorsements, checkride paperwork, and discussions of what a pilot is legally allowed to fly.
Derivation
Certificate' comes from Latin certus, meaning 'sure' or 'settled' — a document that makes a qualification official. 'Rating' comes from the older sense of assigning a class or grade, used to mark the specific level or category of skill attached to the main credential.
Why Pilots Care
The certificate sets the floor for what you can do as a pilot; the ratings on it determine what aircraft and conditions you can legally fly. Flying outside the limits of your certificate and ratings is a regulatory violation and usually an insurance problem as well.
Intuition Check
Do not read certificate as just a paper document or rating as a score. In FAA use, the certificate grants pilot privileges, and the rating defines the specific aircraft or conditions those privileges cover.
Example Sentence 1
She holds a Private Pilot certificate with an airplane single-engine land rating and is working toward her instrument rating.
Example Sentence 2
After passing the checkride, the examiner added the instrument rating to her pilot certificate.