E-commerce, or electronic commerce, refers to the buying and selling of goods and services over the internet through websites, mobile apps, and online platforms. It includes different types such as Business-to-Business (B2B), Business-to-Consumer (B2C), Consumer-to-Consumer (C2C), and Consumer-to-Business (C2B). E-commerce offers several advantages like convenience of shopping anytime and anywhere, access to global markets, reduced costs of physical stores, wide product variety, and easy price comparison. However, it also has disadvantages such as the inability to physically inspect products, risks of fraud and cybercrime, dependence on internet and technology, and possible delivery delays or extra shipping costs. Popular examples of e-commerce platforms are Amazon, Flipkart, Alibaba, eBay, and Shopify.