Virtual DOM is a fundamental ReactJS concept. It is a strategy that ReactJS uses which optimizes the performance of an application. It provides a mechanism to compare two render trees and only modifies what is necessary on the actual DOM.
DOM manipulation is the heart of the modern, interactive web and one of the key concepts of JavaScript. One of the main purposes of JavaScript is interaction with the HTML elements, which is possible due to DOM manipulation.
Dummy text: Its function as a filler or as a tool for comparing the visual impression of different typefaces Dummy text is text that is used in the publishing industry or by web designers to occupy the space which will later be filled with 'real' content.
The most well-known dummy text is the 'Lorem Ipsum', which is said to have originated in the 16th century. Lorem Ipsum is composed in a pseudo-Latin language which more or less corresponds to 'proper' Latin. It contains a series of real Latin words.