An SRV record, which means Service record, is a DNS entry which is used to define the servers that run a certain service for a domain. Quite simply, you can use your domain name not only for a site, but also for an instant messaging server, a video streaming host or even a Voice-Over-IP server, for instance, while you still have an Internet site with it. Whenever you create the SRV record, you can pick what Internet Protocol it's going to use, on which port the connection to the specific server is going to be established as well as the priority and the weight of the record in case that you have several SRV records for the very same service. The latter option will enable you to employ different machines for load balancing and redundancy. Using this kind of DNS records, you can use the same domain many different purposes and even with different providers in case the same one is unable to provide all services you need.