When website designers write the code for websites, there are two computer languages that they use most often—HTML for setting up most of the text sections, and JavaScript for creating “dynamic content” that changes each time the site is visited, such as a message box popping up. More recently, a new multi-browser JavaScript library—one that consists of pre-written script in that language—has been created to make it easier to perform client-side scripting in HTML. That library is called jQuery. It has only been around since 2006, when it was created by computer programmer John Resig, but already more than half of the 10,000 most commonly visited sites use it.

Activities simplified through the use of jQuery

• jQuery makes it simpler and easier to do a number of things with a website, among them: • Navigating through the documents • Handling events—things occurring in an application for which the user has to add a log entry...