The day of the settlement is when the shares are officially transferred to the account of the successful bidder. This marks the completion of the transaction and the successful bidder becomes the rightful owner of the shares. It is an important term to understand in the world of finance, as it signifies the final step in a stock market transaction. Without the settlement, the transaction is not considered complete and the shares do not officially belong to the bidder. So, it is crucial to keep track of the settlement date for any stock market investments.