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Network Service
In computer networking, a network service is an application running at the network application layer and above, that provides data storage, manipulation, presentation, communication or other capability which is often implemented using a client-server or peer-to-peer architecture based on application layer network protocols.Each service is usually provided by a server component running on one or more computers (often a dedicated server computer offering multiple services) and accessed via a network by client components running on other devices. However, the client and server components can both be run on the same machine.Clients and servers will often have a user interface, and sometimes other hardware associated with them.
Network as a Service
The term "Network as a service" (NaaS) is often used along with other marketing terms like cloud computing, along with acronyms such as infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS). NaaS sometimes includes the provision of a virtual network service by the owners of the network infrastructure to a third party. Often this includes network virtualization using a protocol such as OpenFlow.