An SRV record is a DNS record, which is used to redirect a domain name to a third-party server and employ it for a 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 the domain will use and the port, which will be used to connect to the remote server. Furthermore, provided that you have a few SRV records for the exact same service, you'll be able to set individual priorities and weights for every one of them, so you can spread the load between several machines. Such a record will allow you to use the same domain address or subdomains under it with different companies, so you could use it for different purposes even if you are not able to get all the services from one provider.