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jQuery Interview Questions
jQuery is a set of (a rich bundle of) JavaScript libraries that helps users apply dynamic functionality to web pages with great ease. It is designed to simplify the client-side scripting of HTML.
It is very easy to learn and use.
It is used to develop browser compatible web applications.
It improves the performance of an application.
It is very fast and extensible.
It facilitates you to write minimal lines of codes for UI related functions.
It provides a cross-browser support.
These are some effects methods used in jQuery :

show()
hide()
toggle()
fadeIn()
fadeOut()
Easy to learn : jQuery is easy to learn because it supports same JavaScript style coding.
Write less do more : jQuery provides a rich set of features that increase developers' productivity by writing less and readable code.
Excellent API Documentation : jQuery provides excellent online API documentation.
Cross-browser support : jQuery provides excellent cross-browser support without writing extra code.
Unobtrusive :  jQuery is unobtrusive which allows separation of concerns by separating html and jQuery code.
 JavaScript is a language While jQuery is a library built in the JavaScript language that helps to use the JavaScript language.
Dollar Sign is nothing but it's an alias for JQuery. Take a look at below jQuery code.

$(document).ready(function(){
  //script-content
});

Over here $ sign can be replaced with "jQuery" keyword.

jQuery(document).ready(function(){
  //script-content
});
A Content Delivery Network or Content Distribution Network (CDN) is a large distributed system of servers deployed in multiple data centers across the Internet. The goal of a CDN is to serve content to end-users with high availability and high performance.
Code to load jQuery from two types of CDNs :
Google CDN : <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
Microsoft CDN : <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.2.1.min.js"></script>
The  jQuery library is a client side Scripting.

No, jQuery is not a W3C standard.