AWS Direct Connect is a service provided by AWS that allows you to create a high-speed, low latency connection between your on-premises data center and AWS services.
Direct Connect traffic travels over one or more virtual interfaces that you create in your customer AWS account. For SDDCs in which networking is supplied by NSX-T, all Direct Connect traffic, including vMotion, management traffic, and compute gateway traffic, uses a private virtual interface. This establishes a private connection between your on-premises data center and a single Amazon VPC.
You can create multiple interfaces to allow for redundancy and greater availability.