An SRV record is a DNS record, that is used to forward a domain name 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 many others. When an SRV record is created, you can specify an Internet Protocol which the domain will use and the port, which is to be employed to connect to the remote server. Also, provided that you have many SRV records for the same service, you could set various priorities and weights for each one of them, in order to spread the load between several machines. Such a record will enable you to use the same domain or subdomains under it with different companies, so you're able to use it for different purposes even if you are not able to get all services from a single service provider.