CA
Certificate Authority
A trusted entity that issues and signs digital certificates in a PKI.
A CA is the trusted third party in a PKI that verifies an applicant's identity and issues a digital certificate binding a public key to that identity. Relying parties trust certificates because the CA signs them with its private key, and trust chains upward to a root CA held in the device trust store. Compromise of a CA is severe because every certificate it signed becomes suspect, which is why the root is kept offline and intermediate CAs perform daily issuance.
Certificate Authority: the trusted issuer that signs certificates.
Looking CA up is step one. Getting tested on it is step two.
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