What is the difference between My Web and del.icio.us?

What is the difference between a web app, a mobile app, a responsive web page, and a responsive web app?

• Aren't they all the same except for some bindings that match touch commands to mouse commands? I've been building a web-app and want to explore mobile-apps, and I don't know what the difference between using an HTML 5 mobile-app development framework and just making the current web-app responsive is. More specifically, what's the difference between ionic, ratchet 2.0, phonegap, sencha, etc....

• Answer:

  A web application runs on a web server. A mobile application runs on a mobile device. These borders are blurring today, because the application execution doesn't have to be limited to one device anymore, for example a mobile app might put performance intensive processes into "the cloud". "Responsive" refers to the capability of an interface to adapt to different viewport sizes depending on the used device. A web page is the single rendered HTML file, which is used by the browser to display the site. A web application is the combination of database, data manipulation and interface between database and user. When you create a mobile app you have 3 options: create a native app using the tools the manufacturer supplies, create a pure web-app which runs in the devices' browser, or create a hybrid app which runs a web app inside a native wrapper. When you choose the third option you can use JavaScript frameworks like Sencha etc to help you emulate the web app to behave like a native app. Phonegap is a software that supplies various native wrappers for different devices and helps you put your web-app (HTML, CSS and JavaScript based) inside the wrapper.