What is the use of input and output decorators in TypeScript?

Question

Angular

I'm not sure that I understand correctly why fields in components are marked with these decorators @inputand @output. As far as I understand, in this way a connection is established between the parent component and the child.

Answer 1

Hmmm... If earlier it was decent to show incompetence by not distinguishing between javascript and jquery, now, apparently, it's the turn of typescript and angular. Kind of progress.
https://v7.angular.io/guide/template-syntax#input-...
https://v7.angular.io/api/core/Input
https://v7.angular.io/api/core/ Output