what is virtual dom in react

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Dylan
25 Mar 2016
1// dom 
2- With the HTML DOM, JavaScript can access
3and change all the elements of an HTML document.
4- The DOM represents the document as nodes and objects; that way, 
5programming languages can interact with the page.
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9// virtual dom
10- The virtual DOM (VDOM) is a programming concept where an
11ideal, or “virtual”, representation of a UI is kept in memory
12and synced with the “real” DOM by a library such as ReactDOM. 
13This process is called reconciliation.