What is reconciliation in React?

Reconciliation in React is the process of comparing the virtual DOM with the previous version to determine the minimal set of changes needed to update the real DOM.

React creates a virtual representation of the UI, and when the component's state changes, it performs reconciliation to efficiently update only the parts of the interface that have changed, rather than re-rendering the entire DOM.

This improves the performance and responsiveness of applications.

Example: when a list changes, React compares the new array of elements with the previous one and updates only the added, removed, or changed elements in the real DOM.