A public network offering that enables customers to transmit data between LANs at multiple locations. It also is used to access the Internet. Frame relay (FR) was first promoted as a lower-priced substitute for private lines. By using FR, organizations do not have to plan, build, and maintain their own duplicate paths to each of their sites. Multiple users share the FR networks. It is offered by local and long distance (LD) telephone companies.
Frame relay's requirement of defining links between sites in advance, which can be cumbersome for large organizations that want to connect each site to every other site, is leading some companies to choose MPLS VPNs. Falling prices on MPLS service and frame relay's unsuitability for voice are other reasons organizations are starting to migrate to MPLS. However, FR is still a popular, cost-effective choice for organizations.
Source: http://upload.wikimedia.org/wikipedia/en/2/2e/Frame_relay.jpg
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