Digital certificates are the backbone of online trust, providing the mechanism for authenticating websites, users, devices, and software in a secure, scalable manner. In this episode, we examine the lifecycle and infrastructure behind certificates, beginning with the role of Certificate Authorities (CAs) in issuing and signing them. We explain how trust is built through a chain of certificates that link end-entities to intermediate and root authorities, forming a hierarchical structure validated by operating systems and browsers. We also cover certificate revocation mechanisms like Certificate Revocation Lists (CRLs) and the Online Certificate Status Protocol (OCSP), both of which ensure expired or compromised certificates are no longer trusted. Listeners will learn about self-signed certificates, wildcard certificates, and the certificate signing request (CSR) process—all critical components of certificate deployment and management. We conclude with best practices for securely storing private keys, rotating certificates, and maintaining an inventory to support compliance and business continuity. A strong grasp of certificate-based trust is essential for anyone working in secure networking, cloud infrastructure, or authentication systems.