The par value method is an accounting approach used to record the issuance of stock at its par value, which is a nominal or face value assigned to each share of stock. This method plays a key role in understanding how companies manage their equity and reflects the legal capital that must remain in the business, ensuring that it can meet its obligations. It's crucial for distinguishing between the par value of shares and any additional amounts paid by investors, which are recorded in a separate account called 'Additional Paid-In Capital.'