Data Binding In Angular 6

Data-binding means communication between your typescript code of your component and your template which user sees. Suppose you have some business logic in your component typescript code to fetch some dynamic data from the server and want to display this dynamic data to the user via template because user sees only template, here we need some kind of binding between your typescript code and template (view).

source https://www.c-sharpcorner.com/article/data-binding-in-angular-6/