A free and open-source JavaScript library primarily used to design, iterate, and manipulate the HTML DOM. DOM is a tree structure used to represent the elements of a web page. jQuery makes it easy for the designer to use the JavaScript code on their website. An advanced approach to jQuery allows you to create powerful and dynamic websites and web applications.

The syntax of jQuery is designed to simplify things like:

• Document navigation
• Selecting DOM elements
• Create an animation
• Event Management
• Ajax application development.

jQuery is one of the most widely used JavaScript libraries among all other libraries and has the following main features:

• Selecting DOM elements
• Traversal and manipulation enabled by Sizzle (selection engine).
• Create a new programming style
• Merging data structures and DOM algorithms
• jQuery, on the other hand, allows developers to create plugins based on JavaScript libraries. Developers can also create low-level interactions and animation abstractions.

jQuery is part of JavaScript, but there are some differences between the two:

jQuery	JavaScript
JavaScript is a library	It is a dynamic and interpreted programming language for web development.
Users only need to write the necessary jQuery code	The user must write the complete js code
It doesn't take long.	It takes a long time to write the whole script.
No need to troubleshoot cross-browser compatibility issues.	Developers write their own code to handle cross-browser compatibility.
You must include the URL of the jQuery library in the header of your page.	JavaScript is supported by all browsers. No need to integrate additional plugins.
Since this is a js library, it depends on JavaScript.	jQuery is part of Javascript. So, your js code may or may not depend on jQuery.
There are only a few lines of code.	The code can be complex and long.
It's a very simple, easy, and quick approach.	Weakly typed programming approach.
jQuery is a technique optimized for web design.	JavaScript is one of the most popular web design programming languages for developers adopting jQuery.
jQuery builds the DOM faster.	JavaScript takes a long time to build the DOM.