This document provides an overview of e-commerce, including definitions, demographics of online users, benefits and risks for consumers and businesses, and e-commerce business models. It notes that 79% of US adults are online, 52% shop online, and online retail sales are predicted to grow to $250 billion by 2014. The growth of broadband internet access and mobile commerce are driving increases in e-commerce. Risks include security, privacy, and difficulty returning purchases while benefits are convenience, selection, and potentially higher sales.