An SRV record, which means Service record, is a DNS entry employed to outline the servers that run a specific service for a domain. In other words, you will be able to use your domain not only for a web site, but also for an instant messaging server, a video streaming host or even a Voice-Over-IP server, for example, while you still have a website with it. If you create the SRV record, you can choose what Internet Protocol it'll employ, on which port the connection to the particular server is going to be established plus the priority and the weight of the record in case that you have a number of SRV records for the very same service. The second option will permit you to use different machines for load balancing and redundancy. With this type of DNS records, you could use the same domain name many different purposes and even with different providers in case the same one is unable to provide all services that you need.