Which service can be used to connect on-premises networks to AWS VPCs?

AWS Direct Connect is the service that facilitates a dedicated network connection from your on-premises infrastructure to your AWS Virtual Private Clouds (VPCs). This service offers several benefits, including lower latency, more consistent performance, and potentially reduced costs associated with data transfer compared to using standard internet connections.

Amazon CloudFront is a content delivery network (CDN) that helps in delivering data, videos, applications, and APIs to customers globally with low latency. It does not provide capabilities to create a private connection between on-premises networks and AWS VPCs.

Amazon Route 53 is a scalable Domain Name System (DNS) web service designed for routing internet traffic to resources within AWS and other locations. While it plays a role in directing users to your resources, it does not facilitate a physical or virtual connection between your on-premises network and your AWS environments.

Amazon EC2 is a service that provides resizable compute capacity in the cloud. It is used to run applications but does not establish connectivity between on-premises infrastructure and AWS VPCs.

In summary, AWS Direct Connect is specifically designed for the purpose of connecting on-premises networks to AWS, making it the correct choice in this scenario.