What is reconciliation and why is it important?

Reconciliation is the process React uses to update the UI efficiently when state or props

change. React compares the old virtual DOM with the new virtual DOM and calculates the

minimal set of changes required to update the real DOM. This makes React apps fast and

efficient.

Why important:

• It helps React determine the minimal updates needed, avoiding unnecessary

re-renders.

• React uses a diffing algorithm to compare previous and current states to optimize

DOM updates.