- Docker is an open platform for distributed applications and an alternative to standard virtualization that allows developers to build, ship, and run applications anywhere. - In the early days with no budget or awareness, Docker grew its community by building things they requested like memcached as a service, which trended on sites like Hacker News and SlideShare. - Docker scaled its community through an online and offline strategy, treating community members as part of the company and leveraging their products/posts. This included growing their meetup group network to over 98 cities and 38 countries.