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jQuery is a Javascript library to query and update an HTML web page.

jQuery has been one of the most used and extended libraries to make web pages dynamic (client side). Many times, AJAX has been synonym of jQuery.

jQuery is a javascript library which enables queries over a web page, it is like the web page itself is a database. The key point of jQuery are its ability to use the same CSS selectors to find elements, the possibility to chain calls, and bulk operations over sets of results.

Nowadays it is the framework which has more libraries and utilities. In the other hand, new frameworks like AngularJS makes jQuery practically obsolete.

$("p").text("Hello World!");

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