An SRV record is a DNS record, that is used to redirect a domain to a third-party server and employ it for a service different from a website. This can be a Voice-Over-IP server, a video streaming service, an instant messaging system, etc. When an SRV record is created, you could specify an Internet Protocol which the domain will use and the port, that will be used to connect to the remote server. Furthermore, in case you have several SRV records for the same service, you could set various priorities and weights for every single one of them, allowing you to distribute the load between many machines. Such a record will enable you to employ the same domain name or subdomains under it with different providers, so you could use it for many purposes even if you can't get all of the services from one service provider.