An SRV record, which means Service record, is a DNS entry which is used to identify the servers which run a certain service for a domain. Quite simply, you can use your domain not just for a website, but also for an instant messaging server, a video streaming host or even a Voice-Over-IP server, as an example, while you still have an Internet site with it. If you set up the SRV record, you can pick what IP it is going to use, on which port the connection to the particular server will be established along with the priority and the weight of the record assuming that you have a number of SRV records for the very same service. The second option allows you to use different machines for load balancing and redundancy. With this kind of DNS records, you could use the same domain for various purposes and even with different providers in case the same one cannot provide all services you need.