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On the AWS resources, we can read, "AWS Direct Connect enables you to securely connect your AWS environment to your on-premises data center or office location over a standard 1 gigabit or 10 gigabit Ethernet fiber-optic connection. AWS Direct Connect offers dedicated high speed, low latency connection, which bypasses internet service providers in your network path." So it’s a fiber-optic that is connected directly to the AWS infrastructure and not to a standard ISP, so it reduce latency.
https://aws.amazon.com/getting-started/projects/connect-data-center-to-aws/