What is the website eBay.com built off of? What are the main programming/coding components behind it? Did they use PHP and MySQL?
Actually its JSP, take a look at the source code and you wont find any .asp or .php extensions anywhere.
Its Java (jsp as muselkaze says) plus Oracle database see http://highscalability.com/ebay-architecture
No one mentions Zeus webserver? a high performance, high scalable web server Also big corporation like eBay may use a variety of languages, I bet C++/Perl are also used in the back end