An SRV record, which is short for Service record, is a DNS entry that is used to outline the servers that run a specific service for a domain. In other words, you are able to use your domain not only for a website, 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 site with it. If you create the SRV record, you can select what Internet Protocol it'll 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 you have several SRV records for the very same service. The latter option will allow you to use different machines for load balancing and redundancy. With this type of DNS records, you can use the same domain name for a variety of purposes and even with different companies if the same one is unable to provide all services you need.