Ember has always focused on building the best framework that people with different levels of skill can use together to build web applications. Octane updates Ember’s components and reactivity system to make them more modern, easier to use, and just more fun.
Glimmer;‘s Components and Reactivity are the two big changes in this major release from the Ember team. Both are opt-in and fully interoperable with existing code. Read Yehuda’s full announcement for all the details.