I don't know what is gunicorn.sock while using Gunicorn

I don't know what is gunicorn.sock while using Gunicorn

#!/bin/bash
NAME="system"
DJANGODIR=~/Dev/integrasis/v2.0.0/app/integrasis/system/
SOCKFILE=~/Dev/integrasis/v2.0.0/app/integrasis/run/gunicorn.sock
USER=dev
GROUP=dev
NUM_WORKERS=3
DJANGO_SETTINGS_MODULE=system.settings
DJANGO_WSGI_MODULE=system.wsgi
echo "Starting $NAME"
cd $DJANGODIR
source ../bin/activate
export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS_MODULE
export PYTHONPATH=$DJANGODIR:$PYTHONPATH
# Create the run directory if it doesn't exist
RUNDIR=$(dirname $SOCKFILE)
test -d $RUNDIR || mkdir -p $RUNDIR
# Start your Django Unicorn
# Programs meant to be run under supervisor should not daemonize
themselves (do not use --daemon)
exec ../bin/gunicorn ${DJANGO_WSGI_MODULE}:application \
--name $NAME \
--workers $NUM_WORKERS \
--user=$USER --group=$GROUP \
--log-level=debug \
--bind=unix:$SOCKFILE
I have this file named gunicorn.sock empty and don't know what do to see
my aplication like using 127.0.0.1:8000. Someone knows what this file
represent?