Virtual DOM

Operations on the real DOM can be slow and resource-intensive. So libraries like React use the Virtual DOM which is a lightweight copy of the real DOM one.

It acts as an intermediary, allowing efficient updates to the user interface. When a change occurs in the application's state, the Virtual DOM updates first. The framework then compares the new Virtual DOM with the previous version to identify what has changed.

After identifying the differences, the framework updates the real DOM only in the places where changes have occurred.

This approach enhances performance, simplifies development, and ensures cross-browser compatibility.