This document provides an overview of the banking industry. It defines the main categories of financial institutions as investment banks, retail banks, central banks, and commercial banks. It describes the different types of banks such as universal banks, large banks, investment banks, community banks, online banks, credit unions, building societies, and savings and loans associations. The document also outlines the various banking services provided to different types of clients and how financial institutions generate returns. Finally, it discusses some common banking careers.