Live: Google unveils Echo rival Google Home

A crowd gathers ahead of the Google I/O conference at the Shoreline Amphitheater in Mountain View, Calif. It's been a big 12 months for Google. On Wednesday, the tech giant kicks off its I/O developers conference with a keynote address expected to cover plans for its Android mobile operating system, and possibly other ventures including Android Auto. Burke says Android is the most popular operating system in the world. More than 600 Android phones launched last year.