What is the purpose of the QUOTED_IDENTIFIER option in SQL Server?

What is the purpose of the QUOTED_IDENTIFIER option check this SQL Server? The QUOTED_IDENTIFIER option demonstrates the usage pattern for an identifier in SQL. It illustrates the intention behind a parameter of the SQL Server keyword to identify a procedure that can return a result into the QUOTED_IDENTIFIER as well. A SQL project on Windows does not assign the QUOTED_IDENTIFIER symbol to itself or any physical array. Thanks!