This document discusses key definitions and concepts related to banking law and the banker-customer relationship in India. It defines a banker according to Sir John Paget and defines a customer based on the "duration theory". It outlines general characteristics of the banker-customer relationship including that the banker is a privileged debtor, has the right of set-off, and can lend deposited funds. It also discusses special characteristics such as the banker's obligation to honor checks, maintain account secrecy, exercise lien, and charge incidental fees. The document provides context and examples for understanding these important banking law concepts in India.