Explanation/Reference:
Expalantion:
An availability group listener is a virtual network name that clients connect to for database access. On Azure virtual machines, a load balancer holds the IP address for the listener. The load balancer routes traffic to the instance of SQL Server that is listening on the probe port. Usually, an availability group uses an internal load balancer.
References: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sql/virtual-machines- windows-portal-sql-ps-alwayson-int-listener