The primary characteristic of an asteroid is that it is a small, rocky object orbiting the Sun. Asteroids are remnants from the early solar system, composed of various materials such as rock and metal; they vary in size, with some being just a few meters across, while others can span hundreds of kilometers. Most asteroids are found in the asteroid belt between Mars and Jupiter. Unlike planets, asteroids do not have enough mass to become spherical and can be irregularly shaped. Their study provides valuable insights into the history and formation of our solar system, as well as potential resources for future exploration.