Test Drive is an Azure feature that allows users to try out software in the cloud for free, providing a limited duration evaluation experience. To get started with Couchbase Server on Azure, users only need a Microsoft account and can follow step-by-step labs designed by Couchbase to fully evaluate the product within the given time frame. The Test Drive deployment is a fully functional cluster with all features enabled, offering an easy entry point for those interested in learning more about Couchbase on Azure.