E-procurement is the business-to-business purchase and sale of supplies and services over the Internet. It is an vital part of several B2B sites, e-procurement is also sometimes referred as supplier exchange. Typically, e-procurement Web sites allow qualified and registered users to look for buyers or sellers of goods and services. Depending on the approach, buyers or sellers may specify prices or invite bids.

Transactions can be initiated and completed. Ongoing purchases may qualify customers for volume discounts or special offers. E-procurement software may make it possible to automate some buying and selling. Companies participating expect to be able to control parts inventories more effectively, reduce purchasing agent overhead, and improve manufacturing. E-procurement is expected to be integrated with the trend toward computerized supply chain management.