The use of static properties in real world

Shafeeq, as you know, static properties are class properties as opposed to instance or member properties -- they don't change from object to object. So what would make sense to have as class properties.

Say you have an Employee class and you want to assign a unique ID to each employee. You would have an employeeID instance (non-static) property. But you would also have a lastID property to store the number assigned to the last employee created, and you would increment it by 1 for the next employee in your constructor. You wouldn't want lastID to be non-static, and vary from object to object. You want it to be the same for all objects. It couldn't be a constant, because it needs to change every time a new employee is created. But when it changes it changes the same for each object.

Hope this helps.