One usecase is a server that intercepts traffic for multiple domains. For example, a load balancer. I use AWS ELB/cloudfront for SSL termunation and they only

One usecase is a server that intercepts traffic for multiple domains. For example, a load balancer. I use AWS ELB/cloudfront for SSL termunation and they only except one cert, but they can send to multiple back ends. Then the server is routed on the host based on URL.