Hii All ,

• Jquery is a type scripting langauge created by John Resig along with his team in 2006.
• It is a client side script programming language.
• It is a concise javascript library.
• Both javascript and jquery is used for script programming bt jQuery is very lightweight faster  and simpler library.
• jQuery is a open source software i.e you can use jQuery free of cost.
• The syntax of jQuery is designed in such a way so that it will be easily implemented by programmers.
• We need to have proper knowledge of javascript to learn and understand jQuery.
• Using jQuery we can easily select DOM elements and traverse them, create animations,navigate documents, handles many events like adding a class without  the changing the  HTML code, modify content.
• The main motto behind deveplopment of this javascript library was to optimise programming,reducing page load.
• jQuery is also used for deveploping AJAX application such as developing a dynamic website.
• jQuery supports many cross browsers such as IE 6.0+, FF 2.0+, Safari 3.0+, Chrome and Opera 9.0+.

Example:

Html:

<div id="DivOne" class="oddNum">One</div>
<div id="DivTwo" class="evenNum">Two</div>
<div id="DivThree" class="oddNum">Three</div>
<button id="btnOne">Reset odd numbers</button>
<button id="btnTwo">Reset even numbers</button>

JQuery:

$('.oddNum').css('background-color', '#DEA');
$('#DivTwo').css('background-color', '#FCC');

$('#btnOne').click(function() {
    // Action goes here
    $('.oddNum').css('background-color', '#FFF');
});
$('#btnTwo').click(function() {
    // Action goes here
    $('#DivTwo').css('background-color', '#FFF');
});