This document provides an overview of commercial banking. It begins by defining commercial banks as financial institutions that accept deposits from the public and provide loans for investment, with the aim of earning profit. It describes their primary functions as accepting deposits and advancing loans through various products and services. It also discusses secondary functions like agency services, utility services, fund transfers, and their role in credit creation. The document then covers types of commercial banks, significance, money multiplier, challenges, and shifts in the industry. It concludes by presenting a case study on Punjab National Bank covering its non-performing assets, 2018 fraud scandal, regulatory response, and recommendations.