GDGs are local groups of developers who are specifically interested in Google products and APIs: everything from Android, App Engine, and Mobile Web platforms, to product APIs for products like Google Maps, YouTube, Google Calendar, and more. Each local group is called a GDG chapter and can host a variety of technical activities for developers - from just a few people getting together to watch our latest videos, to large gatherings with demos and tech talks, to hackathons. Google Developers supports and recognizes GDG chapters, but doesn’t own or manage them.