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Asked by Kunal Last Modified
Answer 
If we talk about re-render a page using javascirpt when an element in real DOM updated, then DOM will render that element as well as all the children related to that element.so when it comes for complex application. this approch is slower and inefficient.
In React, when the virtual DOM is changed, React compares it to the previous state and current state of the virtual DOM taken just before the update, determines what element was changed, and then updates only that element on the real DOM. This is one method the virtual DOM that optimize performance
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