Understanding Angular data binding

Question

While reading Angular 2 documentation, I came across this (emphasis mine)

Angular processes all data bindings once per JavaScript event cycle, from the root of the application component tree through all child components.

Please explain in as much detail as possible what this means? Especially what is "once per event cycle"?

Answer 1

I think it refers to any change or event triggered(Like changing input field ).Once any change occurs it starts from top to bottom. you can learn more here https://vsavkin.com/change-detection-in-angular-2-4f216b855d4c#.a3ggxt9hl