The process by which space debris becomes terrestrial debris occurs in three stages.
A meteoroid is a small stony or metallic particle (typically smaller than a grain of sand) moving in orbit around the sun. Should it be captured by Earth's gravity and pulled into the atmosphere, it becomes a "shooting star" or meteor as it is consumed in its fiery plunge to Earth. If the original meteoroid is sufficiently large that some of it survives the process of ablation and reaches the ground, it is then known as a meteorite.
Meteorites are distributed uniformly around the planet. However, those people who make it their (lucrative) profession to locate such items usually find themselves in Antarctica at some point. There, pristine ice fields make meteorites readily visible, and the extreme cold aids in keeping them free of microorganisms and other terrestrial contaminants.