Pending transactions are Credit Card transactions that have come through Bank Feeds, but not yet processed. This means that the date listed on the transaction may not be finalised & be subject to change.
This is important to know if you are nearing the end of the month. The date the transaction is finalised may carry over to the next month which will directly affect your Bank Account closing balance.
It also means that the payment has not fully processed.
They are usually labelled Pending, with time your bank will finalise the transaction and set the date as you should wait until the month is done before completely reconciling and closing the month.