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 could 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 that the domain will use and the port, which will be employed to connect to the remote server. Also, provided that you have a few SRV records for the very same service, you could set individual priorities and weights for each and every one of them, allowing you to distribute the load between a number of machines. Such a record will permit you to employ the same domain or subdomains under it with different providers, so you could employ it for different purposes even if you cannot get all of the services from just one provider.