使用.svc文件和在“WCF服务主机”中托管WCF服务有什么区别？

Ive written a service and it has a .svc file. I can browse to this service but this seems to be a strange way of doing it. Im wondering whether is okay to produce a service using a .svc file or should we be looking at using the WCF Service Host and setting up the bindings etc....Ive written a service and it has a .svc file. I