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    <blockquote> <p>Can you describe the paradigm shift that is necessary?</p> </blockquote> <p><strong>Imperative vs Declarative</strong></p> <p>With <strong>jQuery</strong> you tell the DOM what needs to happen, step by step. With <strong><a href="http://en.wikipedia.org/wiki/AngularJS" rel="nofollow noreferrer">AngularJS</a></strong> you describe what results you want but not how to do it. More on this <a href="https://stackoverflow.com/questions/1784664/what-is-the-difference-between-declarative-and-imperative-programming">here</a>. Also, check out Mark Rajcok's answer.</p> <blockquote> <p>How do I architect and design client-side web apps differently? </p> </blockquote> <p>AngularJS is an entire client-side framework that uses the <a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller" rel="nofollow noreferrer">MVC</a> pattern (check out their <a href="http://docs.angularjs.org/guide/concepts" rel="nofollow noreferrer">graphical representation</a>). It greatly focuses on separation of concerns.</p> <blockquote> <p>What is the biggest difference? What should I stop doing/using; what should I start doing/using instead?</p> </blockquote> <p><strong>jQuery</strong> is a library </p> <p><strong>AngularJS</strong> is a beautiful client-side framework, highly testable, that combines tons of cool stuff such as MVC, <a href="http://en.wikipedia.org/wiki/Dependency_injection" rel="nofollow noreferrer">dependency injection</a>, data binding and much more. </p> <p>It focuses on <a href="http://en.wikipedia.org/wiki/Separation_of_concerns" rel="nofollow noreferrer">separation of concerns</a> and testing (<a href="http://en.wikipedia.org/wiki/Unit_testing" rel="nofollow noreferrer">unit testing</a> and end-to-end testing), which facilitates test-driven development.</p> <p>The best way to start is going through <a href="http://docs.angularjs.org/tutorial/" rel="nofollow noreferrer">their awesome tutorial</a>. You can go through the steps in a couple of hours; however, in case you want to master the concepts behind the scenes, they include a myriad of reference for further reading.</p> <blockquote> <p>Are there any server-side considerations/restrictions?</p> </blockquote> <p>You may use it on existing applications where you are already using pure jQuery. However, if you want to fully take advantage of the AngularJS features you may consider coding the server side using a <a href="http://en.wikipedia.org/wiki/Representational_state_transfer#RESTful_web_services" rel="nofollow noreferrer">RESTful</a> approach.</p> <p>Doing so will allow you to leverage their <a href="http://docs.angularjs.org/api/ngResource.$resource" rel="nofollow noreferrer">resource factory</a>, which creates an abstraction of your server side RESTful <a href="http://en.wikipedia.org/wiki/Application_programming_interface" rel="nofollow noreferrer">API</a> and makes server-side calls (get, save, delete, etc.) incredibly easy.</p>
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    1. PO"Thinking in AngularJS" if I have a jQuery background?
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    1. COI think you're muddying up the waters by talking about how jQuery is a "library" and Angular is a "framework"...for one thing, I think it's possible to argue that jQuery *is* a framework...it's an abstraction of DOM manipulation and event handling. It may not be a framework for the same kind of thing that Angular is, but that's the dilemma that the question-asker is in: they don't really know the difference between Angular and jQuery, and for all the questioner knows, jQuery *is* a framework for building client-heavy websites. So arguing about terminology won't clear things up.
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    2. COI think you are the one who is getting confused. This question addresses exactly this http://stackoverflow.com/questions/7062775/. Also, this answer may help clarifying what the difference is between a framework and a library: http://stackoverflow.com/a/148759/620448
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