Do you know what a web app is? A 'proper' web app can be made by iOS developers to appear like a normal application but it is actually running in a modified Safari window, i.e. you need to be connected to the internet for it to work, it is not self contained like a conventional app. GoogleDocs is an example of a web app that runs on any browser.
You can also create your own simple web apps on your devices for your own convenience. They are essentially shortcuts to important or frequently accessed websites. For example, I have one that takes me to the Met Office weather page. If you look on my device, it looks like an app but it is actually a web app: it requires a connected browser to work.
For webpages that you use frequently, like SMO or our lovely new school subscription to 'The Day', you can make your own web app. Here's how you do it:
Web apps from Ruth McGuinness on Vimeo.
Our whole school login details for The Day are on SMO, just enter "the day" in double speech marks in the search field - because I can't write them here :-)