Sunspots are appropriately named. They appear as spots on the disk of the Sun. A sunspot will have a very dark central region known as the umbra. It is often surrounded by a less dark halo known as the penumbra. Think about the root and prefix of this word for a good language lesson.
Spots change over a period of several days.
Penciling in the detailed appearance and location of sun-spots on a fresh piece of paper over several days can give a clear illustration of this. They also move across the Sun as the Sun spins on its axis. Because the Sun is fluid it does not spin as a rigid body. A spot near the equator will take about 25 days to complete one rotation. A spot near a pole, if there were ever one there, will take over a month to make the trip.