Reconciling the bank account(s) is simply the process of verifying that all the items you have entered into your books agree with what the bank statement shows and that you have accounted for all items such as checks written, bank charges and credits, and deposits made. Some of these items may have been created and entered in the books by you but have not yet been recorded by the bank. Or, the bank may have made adjustments to your account which you have not yet posted to your books. These items are referred to as "Outstanding Items".
The most common Outstanding Items are checks that have not yet cleared the bank and, as may often be the case, deposits in transit which the bank has not yet received or credited to your bank account. Other items may result from the bank charging or crediting your account with items which you have not yet recorded in your general ledger. Examine your bank statement and look for any such items (check charges, fees, interest earned, etc.). You must record and post these items to your general ledger bank account before you can accurately finish the bank reconciliation.