Before they hit the ground they are seen as meteors.
Most meteors burn up completely, but some survive - some amazing videos were taken of a meteor event in February 2013 in Russia.
Meteorites are generally of three main types
Iron Stony-Iron Stony
One of the best places to find meteorites is Antarctica, because the dark meteorites stand out against ice.
Professor Sara Russell from the Natural History Museum in London has been to Antarctica to collect meteorites.