What is the spooling? what is the process to run the spopling?

When ever we are doing some action like create a new record or update a new record in siebel clients siebel internally run some sql scripts on the database.
If there is any error occured in the transaction then using spool we can get the sql script to a file.
Then we determine why this happend.
Sppoling means spooling the queries generated internally by siebel to nalyse the performance issues.