Meteoroids are small rocky or metallic bodies that travel through space. They are typically smaller than asteroids, ranging in size from tiny grains to objects about a meter wide. When meteoroids enter the Earth's atmosphere, they can produce bright streaks of light known as meteors. If a meteoroid survives its journey through the atmosphere and lands on the Earth's surface, it is called a meteorite. Meteoroids can originate from various sources, including comets and asteroids, and they play a significant role in understanding the solar system's formation and evolution.