E-commerce, short for electronic commerce, refers to the buying and selling of products or services over the internet. It encompasses a wide range of activities, from online retail and auctions to B2B and B2C sales and services. E-commerce platforms like Shopify, Magento, BigCommerce, WooCommerce, Salesforce, and many others, provides businesses with the tools and features they need to set up and manage an online store, including inventory management, payment processing, shipping and tax calculation, and customer management.