In this video, Brian Maguire explains how to use AWS PrivateLink to securely connect services to external provider applications. He demonstrates how PrivateLink improves upon traditional internet-based connections by offering private, high-performance connectivity within the AWS network. The video covers setting up endpoint services, controlling access, and the benefits of using PrivateLink for shared services, SaaS providers, and on-premises applications. Brian illustrates how PrivateLink simplifies network management, eliminates CIDR overlap concerns, and enhances security by keeping traffic off the public internet.