This document defines various types of banks such as commercial banks, regional rural banks, and development banks. It discusses their basic functions of accepting deposits and lending money. It also outlines the key regulations for bank financial statements and auditing requirements as outlined in the Banking Regulation Act of 1949. Different provisions are applicable for auditing different banks. Non-performing assets are defined as loans that have been classified as substandard, doubtful, or loss based on RBI guidelines. Asset classification and provisioning requirements are also discussed.