What is reconciliation in React?

Reconciliation is the process by which React updates the DOM efficiently when a

component's state or props change. React uses a virtual DOM to compare the new virtual

DOM tree with the previous one and determines the minimal set of changes required to

update the actual DOM.

Key Concepts:

• Virtual DOM: A lightweight representation of the real DOM.
• Diffing algorithm: React’s algorithm compares the old and new virtual DOMs to find

the differences (diffs) and apply the smallest set of changes.

Reconciliation Flow: