The 341 meeting of creditors is a meeting that's required by the bankruptcy code to give creditors and the trustee who is appointed to the case the opportunity to ask the debtor questions under oath about his or her finances, debts, income, and property.
This is more than just a formality. These answers are binding and if you are found to have lied, deceived, or even just made mistakes in your answers, it could cost you your chance at some or all of the debt relief you need. It is best to prepare for this meeting with a bankruptcy attorney.