A spiral galaxy is a type of galaxy characterized by its distinct spiral arms that wind outward from the center. These arms are composed of stars, gas, and dust, creating a beautiful and dynamic structure. The Milky Way is a well-known example of a spiral galaxy, showcasing the intricate patterns formed by its stars. Spiral galaxies are often classified into two main types: normal and barred. In normal spiral galaxies, the arms extend directly from the center, while in barred spiral galaxies, the arms emerge from a central bar-shaped structure. These galaxies play a crucial role in our understanding of the universe and its evolution.