Necessity of D Library (and/or Core Library)

[Anthony Monterrosa via Digitalmars-d-learn]

    Does D require the standard library to function? Or to be 
more direct, does D as a language need its library, or core 
library, to function correctly?

    I have become very interested in how programming languages do 
their magic; how they interact with the computer itself, and 
their inner mechanics. This eventually led me to resources that 
said the line between a language and its library differs between 
languages, and I was wondering where D stood on that line.

    Note: since, I'm already here, does anyone know how D 
manipulates/uses standard streams to make its write/read 
functions as well? I can't find any resources telling me a 
non-abstracted way of this being completed.

P.S. I'm only a freshman computer science student, so if some of 
this should be basic, I simply don't know it yet.

Thanks in advance!