Introductory is relating to, or being a first step that sets something going or in proper perspective
Source text above from : http://www.merriam-webster.com/dictionary/introductory
In this pattern, it has no meaning. It is used only to fill the subject position in the sentence. Thus, it is called introductory "it".
A and B mean the same thing, but sentence B is more common and useful than A. A was introduce mainly to make the meaning of C easier to understand.
Introductory "it" can fill the position both of the subject and object.
Introductory "it" as a subject:
Example of Introductory :
It is easy to make noodle
To ride car is very hard
It is very hard to ride car
To Play PB must be fun
It is fun to play PB
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