An SRV record is a DNS record, that is used to forward a domain name to a third-party server and employ it for a service different from a site. This can be a Voice-Over-IP server, a video streaming service, an instant messaging system, etc. When an SRV record is set up, you could specify an Internet Protocol which the domain will use and the port, that will be employed to connect to the remote server. Also, if you have a few SRV records for the very same service, you'll be able to set different priorities and weights for every one of them, allowing you to distribute the load between a number of machines. Such a record will enable you to employ the same domain name or subdomains under it with different companies, so you could use it for many purposes even if you are not able to get all services from just one provider.