Ecommerce is a sector that involves the buying and selling of goods or services using the internet, and the transfer of money and data to execute these transactions. It is closely tied to business process outsourcing, in which certain operations, such as customer service or information technology, are contracted to third-party service providers. Ecommerce also intersects with finance, given the crucial role of financial transactions and management in online commerce. Additionally, it involves business process reengineering, where companies redesign their existing business operations to improve customer service, cut operational costs, and become world-class competitors. Ecommerce also requires business analysis to identify the needs and determine the solutions for business problems. Overall, it's a dynamic field within the larger domain of business, characterized by its digital nature and focus on leveraging the internet to facilitate commercial transactions.