I don't know how to understand the class "Application"

I don't know how to understand the class "Application" ,can anybody explain for me ,give a example ,thanks!

It's just a class full of static helper functions/properties to do with the application as a whole, e.g. level loading, finding the path to the data folder, etc.

e.g.

Application.LoadLevel("name");  //loads a level called name

Debug.Log(Application.dataPath);  //prints out the path to the data folder

Application.Quit();  //quits the application (except when in editor mode)