A meteor is the bright streak of light—often called a “shooting star”—produced when a space rock (a meteoroid) enters Earth’s atmosphere at high speed and heats and vaporizes from friction with the air.
A meteorite is any piece of that space rock that survives the trip through the atmosphere and reaches the ground. NASA notes that most incoming material burns up as meteors; only survivors that hit the surface are called meteorites (often pebble- to fist-sized).