The Deployments tab shows information about any active server instances.
Manage > Deployments > View Dashboard > Index > Deployments tab
Instances - An active instances that were launched directly from a machine image (AMI, RightImage, etc.).
Default - Each account contains a "Default" deployment. Typically, you will add servers to a deployment from a specific ServerTemplate. However, if you launch a server directly from a ServerTemplate without assigning it to a particular deployment, the server will appear in the "Default" deployment.
Other Deployments - A deployment and its servers will be shown in an expanded view if at least one server instance is active. Deployments that do not contain at least one active server will be displayed below.