CSR - Certificate Signing Request

A Certificate Signing Request (CSR) is a cryptographic file generated by an entity (such as a user or a device) to request a digital certificate from a Certificate Authority (CA). The CSR contains information about the entity and its public key, and it is signed with the entity's private key to prove the legitimacy of the request.

For the Security+ exam, understanding the Certificate Signing Request is relevant in the context of public key infrastructure (PKI), digital certificates, and the process of obtaining a certificate from a trusted authority.