The Trades Widget contains a list of all the trades that are happening real-time for a certain coin pair. 

As you select a cryptocurrency pair on the Markets Widget, the information on the Trades Widget will also be automatically changed to reflect the accurate details corresponding to the market that you have chosen. 

Among the information that you can find here are the date and time by which the trade happened, the price of the coin during the transaction, and the amount of coin that was traded. Prices with green font color are buy transactions while those with red font are sell transactions.