An SRV record is a DNS record, that is used to point 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, and so on. When an SRV record is set up, you can specify an Internet Protocol which the domain will use and the port, that will be employed to connect to the remote server. Also, provided that you have several SRV records for the same service, you can set individual priorities and weights for every one of them, so you're able to distribute the load between many machines. Such a record allows you to use the same domain address or subdomains under it with different providers, so you could use it for different purposes even if you are not able to get all of the services from a single service provider.