jQuery is a fast, lightweight, feature-rich client-side JavaScript library.

It is cross-platform and supports different types of browsers.

It has provided a much-needed boost to JavaScript. Before jQuery, JavaScript codes were lengthy and bigger, even for smaller functions.

It makes a website more interactive and attractive.

It is not a programming language but a well written JavaScript code.

It is a JavaScript code, which do document traversing, event handling, Ajax interactions and Animations.

jQuery is not a programming language but a well-written JavaScript code. It is used to traverse documents, event handling, Ajax interaction, and Animation.

• Used to develop browser compatible web applications
• Very fast and extensible
• Improve the performance of an application
• UI related functions are written in minimal lines of codes

• Most popular and open source
• Very fast and easily extensible
• Commonly implemented UI related functionalities are written using minimal lines of codes
• Reduction in the file size makes the web page load and work faster.
• Used to develop cross browser compatible web applications as jQuery works in almost the same manner for different kinds of browsers.
• Improves the performance of an application when using the minimised version of the jQuery library. The size of the minimized js file is almost 50% less than the normal js file. 

JavaScript is an interpreted programming language, whereas jQuery is a library with APIs built for JavaScript. jQuery simplifies the use of the JavaScript language.

• DOM manipulation
• Event handling
• Animations
• Cross Browser Support
• AJAX Support
• Lightweight

No, jQuery is not the replacement of JavaScript. jQuery is written on the top of JavaScript, and it is a different library.

jQuery is a lightweight JavaScript library which is used to interact with JavaScript and HTML.

• Show()
• Hide()
• Toggle()
• FadeIn() and
• FadeOut()

jQuery is said to be a library of single JavaScript file which consists of DOM/CSS manipulations, event effects or animations, AJAX functions and various commonly used plugins.

AJAX is an acronym standing for Asynchronous JavaScript and XML, and this technology helps us load data and exchange data with the server without a browser page refresh.

JQuery is a great tool that provides a rich set of AJAX methods to develop next-generation web applications.

A jQuery Selector is a function that uses the expressions to find out matching elements from a DOM based on the given criteria. In a simple language, selectors are used to select one or more HTML elements using jQuery. Once an element is selected then we can perform various operations on that selected element.

Selecting an element in DOM is done with the help of $() construct with a string parameter containing any CSS selector expression. $() will return zero or more DOM elements on which you can apply any effect or style.

The $() function is an alias of jQuery() function. It is used to wrap any object into jQuery object which later facilitates you to call the various method defined jQuery object.

You can pass a selector string to $() function, and it returns a jQuery object which contains an array of all matched DOM elements.

Efficiency of web page increases when minimized version of jQuery is used.min.js file will be more than 50% less than the normal js file.

Reduction in the file size makes the web page faster.

No. jQuery works only for HTML documents.

Responding to user actions on a webpage is called events.

jQuery provides simple methods for attaching event handlers to selections. When an event occurs, the provided function is executed.

The jQuery CSS() method is used to get or set style properties or values for selected elements. It facilitates you to get one or more style properties.

Both the methods are used to filter the child of the matched elements. The find method is used to find all levels down the DOM tree, but the children method searches only a single level down the DOM tree.

jQuery no-conflict is an option given by jQuery to overcome the conflicts between the different javascript frameworks or libraries.

When you use jQuery no-conflict mode, you replace the $ to a new variable and assign jQuery some other JavaScript libraries. Also, the $ is used as a function or variable name that jQuery has.

The jQuery toggle() is a particular type of method which is used to toggle between the hide() and show() method. It shows the hidden elements and hides the shown element.

Mac, Windows and Linux are more compatible with the jQuery.

The command $.ui.version returns jQuery UI version.

The ID selector and class selector are the same as they are in CSS.

ID selector uses ID while the class selector uses a class to select elements.

You use an ID selector to select just one element. If you want to select a group of elements, you can use the same CSS class to use the class selector.

• Apply CSS static or dynamic
• Manipulation purpose
• Mainly for Animation effects
• Calling functions on events

.empty() – This method is used to remove all the child elements from matched elements.
$(selector).empty();

.remove() – This method is used to remove all the matched element. It will remove all the jQuery data associated with the matched element.
$(selector).remove();

.detach() – This method is same as .remove() method except that the .detach() method doesn’t remove jQuery data associated with the matched elements.
$(selector).detach();

The jQuery delay() method is used to delay the execution of functions in the queue. It is the best method to make a delay between the queued jQuery effects.

The jQUery delay() method sets a timer to delay the execution of the next item in the queue.

The jQuery html() method is used to change the entire content of the selected elements.

It replaces the selected element content with new contents

A  jQuery connect is a plugin used to connect or bind a function with another function. Connect is used to execute function from any other function or plugin is executed.

Browser compatibility of jQuery plugin is an issue and needs lot of time to fix it.

jQuery.length property is used to count number of the elements of the jQuery object.

It is a library for client-side Scripting.

No, jQuery is not a W3C standard.

• The each() method in jQuery allows us to loop through different datasets such as arrays or objects (even DOM objects).
• It can be used to loop through a number of DOM objects from the same selectors.
• We can also use each() to loop through the arrays of data and get the index and the value of the position of data inside the array.
• You can also use each() to loop through objects.

• Cross-browser support
• Ability to Load JSON, XML, HTML or Scripts
• Simple methods to use
• Ability to send GET and POST requests

The bind() method does not attach events to those elements which are added after DOM is loaded.

Whereas, live() and delegate() methods attach events to the future elements as well.

The difference between live() and delegate() methods is live() function does not work in chaining. It will work only on a selector or an element.

But delegate() method works in chaining.

• Element ID
• CSS Name
• Tag Name
• DOM hierarchy

Yes, instead of $ (dollar sign) we can use jQuery as a function name.

Body.Onload() event will be called only after the DOM and associated resources like images get loaded.

JQuery's document.the ready() event will be called once the DOM is loaded, and it does not wait for the resources such as images to be loaded.

Yes. You can use any number of document.ready() function on the same page.

Bootstrap uses jQuery for JavaScript plugins (like models, tooltips, etc.). However, if you just use the CSS part of Bootstrap, you don't need jQuery.

The param() method is used to represent an array or an object in a serialized manner. While making an ajax request we can use these serialize values in the query strings of URL.

CDN stands for Content Delivery Network or Content Distribution Network.

It is a large distributed system of servers deployed in multiple data centers across the internet. It provides the files from servers at a higher bandwidth that leads to faster loading time. These are several companies that provide free public CDNs.

• Google
• Microsoft
• Yahoo

1. URL – Need to specify the URL to send the request
2. type – Specifies type of request(Get or Post)
3. data – Specifies data to be sent to server
4. Cache – Whether the browser should cache the requested page

jQuery filter is used to filter the specific values from the object. It filters the result of your original query into specific elements.

jQuery Mobile is an HTML5-based user interface system designed to make responsive websites and apps accessible on all smartphones, tablets, and desktop devices.

ID and Element are the fastest selectors in jQuery.

• To get the current value of the first element in the set of matched elements.
• To set the value of every matched element.

jQuery UI is a set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library.

jQuery UI works well for highly interactive web applications with many controls or for a simple page with a date picker control.

attr(): It gets the value of an attribute for the first element in the set of matched element.

prop(): it gets the value of a property for the first element in the set of matched elements. It's introduced in jQuery 1.6.

Class selectors are the slowest selectors in jQuery.

this and $(this) refer to the same element but the difference is that 'this' is used in a traditional method but with $() it becomes a jQuery object on which we can use the functions of jQuery.

Plugins are a piece of code. The jQuery plugins are a code written in a standard JavaScript file.

These JavaScript files provide useful jQuery methods that can be used along with jQuery library methods.