An SRV record, which stands for Service record, is a DNS entry that is used to outline the servers which run a particular service for a domain name. Quite simply, you are 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, as an example, while you still have a site with it. When you set up the SRV record, you can pick what IP it will use, on which port the connection to the specific server will be established along with the priority and the weight of the record in case that there are several SRV records for the very same service. The latter 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 a number of purposes and even with different companies in case the same one can't provide all services you need.