This document summarizes key provisions around the appointment and removal of auditors under Section 139-140 of the Companies Act 2013. It discusses the periods of appointment for individual and audit firm auditors, requirements around rotation of auditors and filling casual vacancies. It also outlines the process for reappointing retiring auditors, circumstances allowing removal of auditors before the end of their term, requirements for auditor resignation, and removal of auditors by the central government.