Google I/O developer conference is an annual 2-day developer-focused conference, held by Google Inc. at Moscone Center in San Francisco, California.

The conference features highly technical, in-depth sessions focused on building of web, mobile, and enterprise applications with Google and open web technologies such as Android, Chrome, Chrome OS, Google APIs, Google Web Toolkit, App Engine, and more.

The conference was started in 2008. The I and O stand for Innovation in the Open, and input/output. The format of the event is similar to that of the Google Developer Day.

The major theme of 2011 so far has been Android: Google Music -- A wireless music streaming service somewhat akin to Amazon Cloud Player and Spotify Honeycomb Update -- To allow honeycomb devices to directly transfer content from USB devices Ice Cream Sandwich -- Merging honeycomb and gingerbread into a unified OS.