Prior to this launch, Application Load Balancers supported only one certificate for a standard HTTPS listener (port 443) and you had to use Wildcard or Multi-Domain (SAN) certificates to host multiple secure applications behind the same load balancer. The potential security risks with Wildcard certificates and the operational overhead of managing Multi-Domain certificates presented challenges. With SNI support you can associate multiple certificates with a listener and each secure application behind a load balancer can use its own certificate.