The Chrome Web Store is an app store where developers can publish apps and games (either free or paid) where Google Chrome users can easily find them. Apps can be installed from the web store directly in the Chrome browser.
Don't post non-programming related question on Stack Overflow.
If you need support with using the Chrome Web Store, create a new thread at the Chromium Apps Google Groups.
General FAQ for developers: https://developers.google.com/chrome/web-store/faq