Let's talk a little bit about overlay networks that we generally hear when the topic is distributed systems. An overlay network is a network which is located (virtually) on another network. It is actually kind of similar to multi layer concept. You have another layer to help other layers do some operations.
Wiki has again a clear definition for this concept which is " . Nodes in the overlay can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network" .
Cloud computing is one of the examples for overlay networks. The nodes run on top of the Internet.
< more details will be outlined soon as more particulars will be covered >
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