What Does Certificate Signing Request (CSR) Mean?

A certificate signing request (CSR) is basically a message that an applicant, usually a person or organization who owns a website that needs to be secured, sends to a certification authority in order to apply for a specific digital identity certificate.

This is a standard procedure in a public key infrastructure (PKI) which allows website owners to prove to their users that the website they are visiting is authentic.

Techopedia Explains Certificate Signing Request (CSR)