What does ORG Assembly Instruction do?

Question

can anyone give me a comprehensive description about ORG directive?
When and why is it used in assembly written applications?

Using Nasm on x86 or AMD64.

Answer 1

ORG means origin ORG is used for specific addressing in microprocessor and microcontroller programming.

For example:

.org 0000H

This means we want to start our program from the 0000H address.