Can someone explain me in simple terms what does

docker run --rm --privileged multiarch/qemu-user-static --reset -p yes -c yes

do when called right before doing a docker build a container from a Dockerfile?

I have the notion that it is to permit the use of containers from other architectures into the X86 architecture, but I am not sure I quite understand the explanation I found in some sites.

Does the presence of the above instruction(docker run) implies that the Dockerfile of the build stage is for another architecture?