The video tutorial explains the concept of building applications using reusable components in React. It describes how the app component acts as the root, with child components forming a tree structure similar to the HTML DOM. The tutorial focuses on the communication between parent and child components using props, a one-way data flow mechanism. It also covers how child components can communicate back to parent components using callback functions. The video concludes with a brief overview of these concepts and a preview of the next video, which will demonstrate these mechanisms in action.

What is the main purpose of using components in a React application?

• To increase the size of the application

• To encourage reusability across different parts of the application

• To make the application look more complex

• To make the application run slower

How does data flow from a parent component to a child component in React?

• Through a two-way binding mechanism

• Via a one-way mechanism known as props

• Using global variables

• By directly modifying the child's state

Which of the following can be passed as props in React?

• Only numbers

• Only functions

• Only strings

• Primitives, arrays, JSON objects, and functions

How does a child component communicate back to a parent component in React?

• Using callback functions passed as props

• By directly modifying the parent's state

• By sending HTTP requests

• Through a global event bus

What is the term used in React for the circular motion of data using props and callbacks?

• Props forward callback

• Data loop

• Props backward callback

• Circular data flow