SQL Full-text Filter Daemon Launcher (SQL Server Configuration Manager)
Beginning in SQL Server 2008, the SQL Full-text Filter Daemon Launcher (FDHOST Launcher) service is used by SQL Server full-text search to start the filter daemon host process, which handles full-text search filtering and word breaking. This service must be running to use full-text search. The FDHOST Launcher service is an instance-aware service that is associated with a specific instance of SQL Server. The FDHOST Launcher service propagates the service account information to each filter daemon host process started. For information about the filter daemon host processes, see "Full-Text Search Architecture" in SQL Server Books Online.