This excerpt taken from the EBAY 10-K filed Feb 17, 2010.
Our Marketplaces and Payments platforms utilize a combination of proprietary technologies and services as well as technologies and services provided by others. We have developed intuitive user interfaces, customer tools and transaction processing, database and network applications that help enable our users to reliably and securely complete transactions on our sites. Our technology infrastructure simplifies the storage and processing of large amounts of data, eases the deployment and operation of large-scale global products and services and automates much of the administration of large-scale clusters of computers. Our infrastructure has been designed around industry-standard architectures to reduce downtime in the event of outages or catastrophic occurrences. We are continually improving our technology to enhance the customer experience and to increase efficiency, scalability and security. For information regarding technology related risks, see the information in Item 1A: Risk Factors under the captions Our failure to cost-effectively manage certain aspects of our business could harm us, and System failures could harm our business.