LD SCRIPT

What is ld script ?

Why we are using that ?

Where can i get the complete and detailed explanations regarding the ld
script used ?

Maybe, "linker directive" Google.

Could you give some context?  Compiling?  libraries?

A linker scripts instructs the linker about the layout of the binary it
should create from the object files. For more details refer
http://sourceware.org/binutils/docs/ld/, chapter 3