This document discusses different types of e-marketplaces, including company-centric marketplaces where a company auctions excess inventory on their website, private B2B marketplaces where a group of companies purchase supplies online, and web-based reverse auctions where suppliers bid on projects. It also describes the goals of procurement management to streamline purchasing and reduce errors, and how internet-based XML can provide enhanced capabilities and access to small businesses over traditional EDI. Finally, it outlines the key functions of a market as matching buyers and sellers, facilitating transactions, and providing institutional infrastructure to support exchange.