You use props to allow a component to receive input from its parent. Props are immutable in the child component and are defined as part of the component definition object as shown in the following code:

<script>
export default {
  name: 'Child',
  props: {
    greet: String,
  },
}
</script>

In the preceding code, the Child component expects an input from its parent, specifically, a prop named greet of the type String.