E-commerce involves the buying and selling of products or services over electronic systems such as the internet and mobile apps. It is driven by technological advances in areas like mobile commerce and online transaction processing. There are three main areas of e-commerce: online retailing, electronic markets, and online auctions. COVID-19 has led to increased online sales but also disruptions to supply chains and staffing. E-commerce companies have responded by focusing on digital initiatives, analytics, safety measures, and contactless delivery.