OCSP stapling is a solution that allows the web server to provide a time-stamped OCSP response signed by the CA along with the certificate during the TLS handshake, eliminating the need for the client to contact the CA separately to validate the certificate. OCSP stapling can reduce the delay caused by the certificate validation process by saving a round-trip between the client and the CA. It can also improve the security and privacy of the certificate validation by preventing potential attacks or tracking by malicious third parties. Verified Reference:
https://en.wikipedia.org/wiki/OCSP_stapling
https://www.digicert.com/knowledgebase/ssl-certificates/ssl-general-topics/what-is-ocsp-stapling.html
https://www.entrust.com/knowledgebase/ssl/online-certificate-status-protocol-ocsp-stapling