This book has a fast-paced and practical approach. It focuses on features, tutorials, quick-explanations, tips-n-tricks, and live real-world examples, using script.aculo.us. It contains complete code for all projects, all in an AJAX way. The author uses his vast experience as a programmer to show an interesting and creative way of building web applications. This book is for web developers who build simple yet agile and useful web applications. It is useful for PHP beginners and assumes basic knowledge of HTML, CSS, JavaScript, and PHP. The examples in the book use PHP, but can be adapted easily to other languages.