This is a debit/credit/balance sheet of all of the funds related to your real estate transaction. You should go over this and if there is anything that you do not understand or is in question, have your escrow officer explain it to you.
Your closing statement is also an important document when it comes to taxes. Your accountant will want to see it for the costs incurred and/or the profits gained. To learn more about the closing statement: http://www.realestateabc.com/homeguide/escrow3.htm