Spiral galaxies are one of the most prevalent forms of galaxies in the universe, with rotating disks, spiral arms, and central bulges. Spiral galaxies exhibit a combination of stellar populations, gas, dust, and dark matter, and therefore represent excellent laboratories for investigating galactic structure, dynamics, and evolution.Spiral galaxies, such as the Milky Way and Andromeda, reveal the history of galaxy formation, evolution, and interactions. Observations with optical, infrared, and radio telescopes describe the distribution of stars, gas, and dark matter. In conclusion, spiral galaxies are disk-shaped, rotating systems with well-defined disks, spiral arms, and central bulges. Their star-forming activity, structural variety, and dark matter content have placed them at the heart of research into galaxy dynamics, evolution, and cosmology.