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Client Side JavaScript (Ajax, jQuery)
Server Side JavaScript (NodeJS)
For improve UX (user experience) and developing dynamic web page applications.
Website and Web-application is mainly distributing or presenting the data to users(viewer)
Here, technically manipulating or distributing the data into client(browser) from web-server(Apache).
We feel, while displaying the details(manipulating or distributing) into the browser should be simple, attractive, flexible to all internet devices and fast loading from webserver,
That's why we are using some client technologies like Javascript, Jquery, Ajax, Json, etc.
It's a way to improve user experience. Imagine browsing on Facebook and for each comment we add, the page reloads completely. This makes the experience boring and distracting. Ajax (Asynchronous Javascript and XML) is employed to interactively load data from the server whilst the page is not navigated away.
I would say Ajax is quite different technology than the rest- because with ajax you are retrieving and sending data to server without changing any display of existing page - means you can keep your focus or make changes on the list box and instantly you can focus on other options too- whereas if you want to achieve this functionality in asp.net you need to work on post back event that takes time on front end area.
For better user experience and speed of the site. Ajax mainly faster the website by loading the content of the site without refreshing.