Terminology
VPS / VDS - a virtual or dedicated server purchased from one of the providers.
Panel / Dashboard - the Cobalt dashboard itself.
Server - a game server created using Cobalt. You can have multiple servers on a single VPS / VDS.
Docker - a suite of tools for creating isolated applications. Cobalt is built entirely on Docker. Its entire infrastructure and game servers are created using it.
Docker image - a standalone package containing everything needed to run the application or set up a server.
Docker container / Container - a standardized, encapsulated environment that runs applications or servers.
Loader - a specific server implementation or mod framework used to run the game server (e.g. Vanilla, Paper, Forge, Fabric).