Two-way data binding in Vue.js

What is two-way data binding in Vue.js?
You can update dom with your Vue instance also when you update DOM you can get those updates to Vue

Following example shows the one-way binding. Value of the email field is updated by the email data property of the Vue instance. But, when the user types in the input field you can not see the updates inside the div element

So to make two-way binding you can change the line 12 with v-model