Ecommerce refers to commercial transactions conducted electronically, typically over the internet. It offers businesses opportunities to market and sell products to customers 24/7 through an online storefront. There are different types of ecommerce relationships, including business-to-business, business-to-consumer, and consumer-to-consumer. While ecommerce has advantages like low startup costs and international sales potential, it also faces disadvantages such as site crashes preventing purchases and an inability to try products before buying. Ecommerce accounts for trillions in annual sales globally and is predicted to nearly double in value by 2040.