jQuery Interview Questions
1 .
What is jQuery ?
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.
2 .
Why do we use jQuery ?
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.
3 .
What are the effects methods used in jQuery ?
These are some effects methods used in jQuery :

show()
hide()
toggle()
fadeIn()
fadeOut()
4 .
What is advantages of jQuery ?
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.
5 .
How JavaScript and jQuery are different ?
 JavaScript is a language While jQuery is a library built in the JavaScript language that helps to use the JavaScript language.
6 .
What does dollar sign ($) means in jQuery ?
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
});
7 .
What is a CDN ?
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.
8 .
How to load jQuery from CDN ?
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>
9 .
jQuery library is server scripting or client scripting ?
The  jQuery library is a client side Scripting.

10 .
Is jQuery a W3C standard ?
No, jQuery is not a W3C standard.