foreign_data_wrappers contains all foreign-data wrappers defined in the current database. Only those foreign-data wrappers are shown that the current user has access to (by way of being the owner or having some privilege).
Name of the database that contains the foreign-data wrapper (always the current database)
Name of the foreign-data wrapper
Name of the owner of the foreign server
File name of the library that implementing this foreign-data wrapper
Language used to implement this foreign-data wrapper