A company that delivers and manages network-based services, applications, and equipment for a fee. An MSP may load a company's application data on its servers, customizing it as necessary, and operating the service at a remote data center. An MSP might manage a company's entire wide area network (WAN), perhaps including dedicated leased lines, a frame relay network, and an IP-based virtual private network (VPN). See also ASP, frame relay, IP, server, and VPN.