The main role of an auditor in the corporate sector is to determine if a company's financial statements comply with accounting principles and to protect shareholder interests. An auditor is appointed by a company to audit its financial records and reports. The auditor's duties include verifying financial reports, assisting with investigations, and reporting on matters of concern to shareholders. The auditor must also follow the Companies Act, consider judicial decisions, and adhere to ethical standards regarding auditor independence and responsibilities.