What is the meaning of sending ? in sql query in SSIS task

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SSIS

SQL-Server-2008R2

Hi All,

I am new to SSIS and now need perform some migration from 2005 to 2008.

While performing this I have opened one of the SQL task which was logging some package info into DB. When I opened the query I found that ? in the SQL query. Please check in the below line:

EXEC  dbo.usp_LogPackageStart @ID = ?,@Name =? ,@Description = ? ,@Frequency =?,@ProcessedKey = ?,@ProcessdDate = ? 

result set is choosen as "Single Row" . Can any one tell me what values will be replaced in "? " place while executing SQL and What is the meaning of Single row in such situation.

Thanks in Advance
Prashant