jQuery Introduction

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jQuery is a javascript library that is created to make the common tasks trivial because using raw JavaScript can result in dozens of lines of code for each task.
jQuery is small, lightweight, and easy to learn for beginners.
The motive behind the creation of jQuery is: Write less, do more
It is a platform-independent technology.

The jQuery library provides a general-purpose abstraction layer for common web scripting. The main tasks that we can perform by using jQuery are:

Access parts of a page: jQuery offers a robust and efficient selector mechanism for retrieving exactly the piece of the document that is to be inspected or manipulated.
Modify the appearance of a page: jQuery can change the classes or individual style properties applied to a portion of the document even after the page has been rendered.
Alter the content of a page: jQuery can modify the content of a document. By using jQuery we can change the text, insert or swipe an image, change the order of a list and change the entire structure of an HTML page.
Respond to a user's interaction with a page: The jQuery library offers an easy way to intercept a wide variety of events with event handlers without the need to change the HTML code.

Related topic:

jQuery History

jQuery Intallation

Add animation to a page: jQuery provides an array of effects such as fades and wipes, as well as a toolkit for crafting new animations to make the web page attractive.
Retrieve information from a server without refreshing a page: This code pattern has become known as Asynchronous JavaScript and XML (AJAX). The jQuery library removes the browser-specific complexity from this process, allowing developers to focus on the server-end functionality.
Simplify common JavaScript tasks: jQuery provides enhancements to basic JavaScript constructs such as iteration and array manipulation.
Allow multiple actions in one line: jQuery use a programming pattern called chaining which avoids the overuse of temporary variables or wasteful repetitions.