Meteorites are rocks from space that strike the Earth. Meteoroids are the same kind of object as meteorites, only they are still in space. Meteoroids could be tiny particles left behind by a comet or can even be an asteroid.
Meteoroids are in orbit around the Sun.
Meteorites are usually classified as stones, irons or stony irons. Have been known to be very large. The picture above is an example of a Meteor shower.