E-Commerce or Electronic Commerce refers to buying and selling of goods, products, or services online or over the internet. It includes transactions of money, funds, and data are also considered as e-commerce. These business transactions can be done in four ways: Business to Business (B2B), Business to Customer (B2C), Customer to Customer (C2C), Customer to Business (C2B). Example of e-commerce websites include Amazon, AliExpress, Ebay, Shopify, Tonaton, Olx etc. Global retail e-commerce is expected to reach up to $27 Trillion in 2020.