Google I/O is the company's yearly developer conference, held at Moscone West in San Francisco's South of Market district. It's where thousands of developers, partners and press come together to see the latest announcements on Google's platforms, services and (usually) products.
If history repeats itself, we'll get a bunch of new Android news — and probably a peek at the upcoming M version of Android. Also expect some Google Pay announcements, and updates to existing products.
Chrome usually (and understandably) plays a big part in the I/O announcements as well, and expect for more on that front in the coming weeks, too.