The document discusses the history and functions of automated teller machines (ATMs). It describes how the first ATM was introduced in 1967 in London to reduce customer time and bank costs. ATMs allow 24/7 access to cash withdrawals, balance checks, funds transfers and bill payments using plastic cards and PINs for security. The document outlines the common components of ATMs like card readers, keypads, displays and cash dispensers. It also reviews the programming elements like loops, if/else statements and switch cases used to develop ATM management systems.