An SRV record is a DNS record, that is used to direct a domain name to a third-party server and use it for some service different from a site. This can be a Voice-Over-IP server, a video streaming service, an instant messaging system, and many others. When an SRV record is set up, you could specify an Internet Protocol which the domain address will use and the port, which is to be used to connect to the remote server. Also, provided that you have many SRV records for the exact same service, you'll be able to set individual priorities and weights for every single one of them, so that you can send out the load between a number of machines. Such a record allows you to employ the same domain or subdomains under it with different providers, so you could use it for various purposes even if you can't get all services from one service provider.