jQuery is the most popular library
on the web today. It's a library of JavaScript functions that make it easy for webpage developers
to do common tasks-- like manipulating the webpage,
responding to user events, getting data from their servers,
building effects and animations, and much more. jQuery builds on top of the functionality that browsers give us
via the JavaScript DOM API, but lets us accomplish the same things
in fewer lines of code. For example, let's say you wanted to
resize all of the images on your page, like when the user clicked a button. You could write these
four lines of code here, and that would work. Or, you could write
this single line of code, and jQuery will do all the
heavy lifting for you. Plus, jQuery takes care of any
cross-browser bugs or inconsistencies. In 2014, over 60 percent of the
top million webpages included jQuery. So, pretty much all web developers
either know jQuery, or have used jQuery
at some point in their career. And now you can become
one of those developers.