A meteor shower is the result of the earth encountering the debris of a comet as it sweeps out its orbit around the sun. The Eta Aquarids result from debris left behind by the famous Comet Halley. A meteor is most often just a tiny particle of dust, about the size of a grain of sand, that burns up from friction as it enters the earth's atmosphere. Brighter meteors result from larger particles. If large enough, they can withstand the friction of entry into the earth's atmosphere and strike the ground. They are then called meteorites and are highly prized by scientists and collectors alike. They are pieces of the original matter that formed our solar system 4.5 billion years ago. Good luck if you go out watching on Friday night/Saturday morning.
The constellation Aquarius with the star "Eta" labelled. This is the radiant of the Eta Aquarids meteor shower. You do not have to be looking at the radiant to see shower members. It's best to just lie down and watch the zenith (point over head) after midnight. However, the Eta Aquarids are best seen from the Southern Hemisphere.