Thread: What is a native call?

Gurus,

What is a native function call?
I tried googling but could not get specific information.
Is this the ability to call the subroutine of a language #B from a program written in program #A? (this is my current understanding)
How is this achived?
How does it work?
Are there any standard guiding this?

Thanks in advance,
Satya Prasad