An SRV record is a DNS record, which is used to forward a domain to a third-party server and use it for some service different from a website. 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 can specify an Internet Protocol the domain will use and the port, which will be employed to connect to the remote server. Furthermore, provided that you have many SRV records for the exact same service, you'll be able to set different priorities and weights for each one of them, so you're able to spread the load between many machines. Such a record will allow you to employ the same domain or subdomains under it with different companies, so you can use it for different purposes even if you can't get all of the services from a single service provider.