It's versatility and flexibility to incorporate other scripting languages (i.e. CSS, JavaScript, X-HTML, etc.) within it. Also, the ability to output things like PDF, Image, Movies. easy to learn very easy to learn, source code will be available so that one can view and edit easy to learn easy to understand is more simple to understand | Python. More flexible, downloads for free, runs on same O/S as PHP -- but it's a higher-level programming language that supports strings and more sophisticated functionality, such as game development, file sorting and management, etc. | 