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