This document discusses e-marketplaces and their components. It defines an e-marketplace as a marketplace where buyers and sellers exchange goods and services electronically. The key components of an e-marketplace include customers, sellers, products/services, and infrastructure to support the front-end and back-end business processes. The document also describes different types of e-marketplaces ranging from individual electronic storefronts to online malls and portals that bring together multiple buyers and sellers.