This document provides an overview of automated teller machines (ATMs). It discusses the history and development of ATMs, beginning in the late 1960s in the UK, Sweden, and the US. Key developments included the introduction of card-based access using personal identification numbers in the late 1960s. The document also describes common ATM components, locations, financial networks, global usage, security features, and related technologies. It provides details on the earliest ATM models and locations of notable ATMs around the world.