- Supports an availability group listener for each availability group. An *availability group listener* is a server name to which clients can connect in order to access a database in a primary or secondary replica of an Always On availability group. Availability group listeners direct incoming connections to the primary replica or to a read-only secondary replica. The listener provides fast application failover after an availability group fails over. For more information, see [Availability Group Listeners, Client Connectivity, and Application Failover (SQL Server)](../../../database-engine/availability-groups/windows/listeners-client-connectivity-application-failover.md).
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