Simplify the following text for a Grade 8 native English-speaking person.
Original: Google I\/O is an annual two-day developer-focused conference , held by Google at Moscone Center in San Francisco , California , featuring highly technical , in-depth sessions focused on building of web , mobile , and enterprise applications with Google and open web technologies such as Android , Chrome , Google APIs , Google Web Toolkit , App Engine , and more .
Simplified: Google uses it to talk about new web technologies . Google Android , Google Chrome and Google Wave are technologies that have been shown there .