E-commerce is buying and selling goods or services using the internet. E-commerce enables businesses to reach a global market without the need for physical stores. It includes various models such as B2B, B2C, C2C, and C2B. Key components of e-commerce include an online storefront, payment processing, and logistics for delivering products to customers. E-commerce has revolutionized retail by providing convenience, a wide range of products, competitive pricing, and personalized shopping experiences through data analytics and customer feedback.