Certificate Signing Request (CSR) Glossary Definition

A Certificate Signing Request (CSR) is a request package sent to a certificate authority so a public-key certificate can be issued for an identity, server, or service.

Certificate Signing Request (CSR) appears in secure-communications designs, certificate management, cryptographic reviews, and compliance documentation. It is retained here because professionals may encounter the term in NIST guidance, security reviews, or technical documentation and need a concise public explanation.