When QuickBooks downloads bank data, it tries (among other things) to find a match with any QuickBooks transactions you created manually. If it finds a likely match, it lists the transaction in the Recognized tab and displays the word "MATCH" in green in the row.
You can find out more about the types of matches QuickBooks looks for.
If you’re satisfied with the match information shown in the row, simply click Match at the end of the row to move the bank item into QuickBooks and match it with the existing QuickBooks transaction.
QuickBooks displays at least one possible match from existing entries, like payments from customers and purchases to vendors. For example, if an invoice payment matches a downloaded income transaction, QuickBooks suggests it as payment for the invoice.
If you found the right transaction to match, but the amounts are slightly off (due to discounts or fees, and so on), you can make an adjustment to resolve the difference.
Match to multiple transactions
Undo an add, match, or transfer
Resolve the difference in a matched transaction
Types of matches for downloaded transactions