One would frequently notice this training redirect construct in many Unix commands – all it means is, ALL output from this command should be pushed into /dev/null.
> /dev/null 2>&1
/dev/null is a place where we can dump anything we don’t want to use. Since, 1 is stdout and 2 is stderr: 2>&1 can be interpreted as redirect stderr to stdout. Thus, Error messages which go to stderr are redirected to stdout which is being redirected to dev/null. Therefore, no output at all.