Grid architecture is often described in terms of "layers", where each layer has a specific function. The higher layers are generally user-centric, whereas lower layers are more focussed on computers and networks: hardware-centric.

STARTING LOW: The lowest layer is the network, which connects grid resources.

NEXT IN LINE: Above the network layer lies the resource layer: actual grid resources, such as computers, storage systems, electronic data catalogues, sensors and telescopes that are connected to the network.

THE MIDDLEWARE LAYER : The middleware layer provides the tools that enable the various elements (servers, storage, networks, etc.) to participate in a grid. The middleware layer is sometimes the "brains" behind a computing grid!

UP TOP: The highest layer of the structure is the application layer, which includes applications in science, engineering, business, finance and more, as well as portals and development toolkits to support the applications. This is the layer that grid users "see" and interact with. The application layer often includes the so-called serviceware, which performs general management functions like tracking who is providing grid resources and who is using them.