An SRV record is a DNS record, that is used to direct a domain to a third-party server and use 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 could specify an Internet Protocol the domain will use and the port, which is to be used to connect to the remote server. Moreover, if you have several SRV records for the same service, you could set various priorities and weights for every one of them, so you're able to spread the load between a number of machines. Such a record will permit you to use the same domain address or subdomains under it with different companies, so you're able to employ it for various purposes even if you cannot get all of the services from a single service provider.