E-commerce refers to the buying and selling of products or services over electronic systems such as the Internet. It includes the entire online process from developing and marketing products to delivering, servicing, and receiving payment. There are several types of e-commerce including business-to-business, business-to-consumer, consumer-to-consumer, business-to-government, and mobile commerce. E-commerce provides benefits such as reduced costs, increased flexibility, and access to new markets, but also poses risks such as security issues and lack of quality guarantees.