An SRV record is a DNS record, that is used to direct a domain to a third-party server and employ it for some service different from a web site. This could be a Voice-Over-IP server, a video streaming service, an instant messaging system, and so forth. When an SRV record is created, you can specify an Internet Protocol that the domain will use and the port, that will be employed to connect to the remote server. Furthermore, provided that you have many SRV records for the same service, you could set individual priorities and weights for each one of them, so you're able to distribute the load between many machines. Such a record will enable you to employ the same domain or subdomains under it with different companies, so you can use it for many purposes even if you cannot get all the services from just one provider.