Definition
A transit gateway is a network hub that connects virtual private clouds VPCs and on-premises networks through a single point of contact. It acts as a router for your cloud network, simplifying connectivity and management by eliminating the need for complex mesh networks. This allows for more efficient and scalable network architectures, reducing operational overhead and improving overall network performance. For instance, a company can use a transit gateway to connect its development, testing, and production VPCs, ensuring secure and isolated environments. Unlike a VPN connection which typically links two specific endpoints, a transit gateway can manage connections to multiple VPCs and on-premises locations simultaneously. Understanding transit gateways is crucial for cloud networking and security domains, appearing on AWS certification exams like the Solutions Architect Associate and cloud security certifications such as CCSP.