Spiral galaxies are rotating disks of mostly of hydrogen gas, dust and stars. Looking with a telescope or binoculars, the bright nucleus may be visible but the spiral arms are dimme and harder to see. Spiral galaxies are complex objects that have a disk, a bulge and a halo. The disk contains gas, dust and young stars while the bulge contain mostly old stars without gas or dust. The halo has very few stars and global clusters. It also has dark matter in the spiral galaxy.
The spiral galaxies usually like to live together in groups clusters although it is not very common to see them in clusters, they are less common than ellipticals in the regions betwen clusters.