An SRV record, which signifies Service record, is a DNS entry which is used to define the servers that run a certain service for a domain. Basically, you can use your Internet domain not only for a site, but also for an instant messaging server, a video streaming host or perhaps a Voice-Over-IP server, for instance, while you still have a site with it. If you create the SRV record, you may choose what Internet Protocol it's going to use, on which port the connection to the specific server will be established plus the priority and the weight of the record assuming that you have several SRV records for the very same service. The second option will enable you to use different machines for load balancing and redundancy. With this kind of DNS records, you can use the same domain address for a number of purposes and even with different providers in case the same one can't provide all services that you need.