Last, but not least, is two-way binding, which is essentially a combination of event and property bindings. Not every property can be used with two-way binding, since it requires a certain convention and is used mostly in forms.
Two-way binding is used to bind an element's property to component data, in addition to updating the component data when the target element's property changes. You use two-way binding by surrounding a property with both parentheses and square brackets:
<input [(ngModel)]="myNameField" />
In the preceding example, ngModel is set with a two-way binding; thus, the input value is bound to the component's nameInput field and vice versa, so nameInput should change when the input value changes.
ngModel is ...
