Server (video) - A Server is a storage system that provides audio and video for a network of users (ie. clients, viewers, subscribers.) While there are some analog systems based on optical disks, many used in professional and broadcast applications are based on digital disk storage.
  Perhaps with the exception of those used for On Demand Programming (VOD), the three areas of television operation that often use video servers are transmission, postproduction and news.  Compared to general purpose file servers, video servers must handle far more data than the standard server as these files are larger and must be continuously delivered.
  The performance between server models can vary greatly.  This can be due to compression ratio, storage capacity, number of channels and especially degree of access to stored material.

Server-based Personal Video Recorder – (May be known as Network Personal Video Recording {nPVR}) - The Digital Video Recorder/(Personals Video Recorder) is largely part the Network Operator’s server.  Its function would be much the same as if the DVR was at the viewer's home. This could have more implications for Satellite TV as VOD service for satellite operators are restrained by bandwidth limitations and the limited storage capacity of DVRs.

Server-based SVOD Programming – Typically the Subscription Video on Demand programming offered by digital cable providers (networks) use servers to store the VOD programming. Satellite TV on the other hand typically needs a storage device at the customer’s location, such as a Digital Video Recorder, to store the VOD in before the customer can watch it. Server-based SVOD Programming is often considered the better form of SVOD programming compared to Nonserver-based SVOD Programming, due primarily to the bandwidth limitations of Nonserver-based SVOD.

Server Clustering - Network design in which all the servers on one or more rings are placed in a central location.

Server Farm - Network design in which a cluster of servers in a centralized location serve a wide user population.