Hi Shishir,
Indeed, Maybe doesn't grant you additional operational functionality that other languages lack. Most use-cases of Maybe can be matched in nearly all mainstream languages through the use of NULL.
Maybe illustrates a desired lack of functionality in cases where it is absent.
For example, in Java:
public static Integer myMethod(Integer a, Integer b) {
// body
}
What do we know about this method from the signature?
You would think it is a method that takes two integers and returns an integer, but really it could take NULLs too, and could possibly return a NULL.
Here is the equivalent Haskell signature:
myMethod :: Maybe Integer -> Maybe Integer -> IO (Maybe Integer)
We can see that Maybe allows us to replicate the possibility of NULL values from other languages... But how is that special since other languages already have this built-in.
Now look at the following Haskell signature:
myMethod :: Integer -> Integer -> Integer
Now what do we know about this?
We know that it takes two Integers and returns an Integer.
This is the power that comes from having Maybe as the canonical way to represent the possibility of missing values.