Advanced JavaScript - Chapter 3 - JavaScript - this keyword - Call and Apply

Call() and apply() :
In JavaScript, a function can be invoked using () operator as well as call() and apply() method as shown below.

Call() and apply() :
The main purpose of call() and apply() is to set the context of this inside a function irrespective whether that function is being called in the global scope or as object's method.
We can pass an object as a first parameter in call() and apply() to which the inside a calling function should point to.

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[akashgupta]

Please explain sample: Demo ... I can't understand clearly ??