An SRV record, which means Service record, is a DNS entry which is used to identify the servers which run a specific service for a domain name. Quite simply, you’re able to use your domain name not just 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 a website with it. If you create the SRV record, you can select what Internet Protocol it's going to use, on which port the connection to the specific server is going to be established along with the priority and the weight of the record assuming that there are several SRV records for the very same service. The second option will allow you to use different machines for load balancing and redundancy. Using this type of DNS records, you may use the same domain name many different purposes and even with different companies if the same one can't provide all services you need.