A React application is built up of a tree of components called the Component ______________.

A React application is built up of a tree of components called the Component Hierarchy.

In React, components are the fundamental building blocks used to construct user interfaces. These components can be thought of as individual units that manage their own state and, when combined, create a complex interface. The term "hierarchy" refers to the structured relationship between these components, where each component can contain other components, forming a parent-child relationship.

This hierarchical structure enables better organization and reusability of code, as components can be reused across different parts of an application. The root component serves as the entry point of the application, and each sub-component can communicate with its parent or children through props and state, thereby ensuring a clear data flow within the application. In summary, the component hierarchy is essential for managing the organization and rendering of components in a React application effectively.