They are caused by intense magnetic activity, which inhibits convection by an effect comparable to the eddy current brake, forming areas of reduced surface temperature.
From Wikipedia:
Because the sunspots are cooler spots on the sun. They are much different from the rest of the sun so the appear really dark.
they are in the convective zone
Sunspots
Dark spots that appear on the surface of the sun are called sunspots. They are areas of reduced temperature caused by interactions with the sun's magnetic field.
They appear in the Photosphere. That's basically the "surface" of the Sun.
Sunspots are cooler than the surrounding gases on the sun, which is why they appear darker in comparison. They are caused by fluctuations in the sun's magnetic field, leading to areas of reduced temperature.
Blemishes on the sun are called sunspots. They appear as dark spots on the sun's surface and are caused by variations in its magnetic field. Sunspots are temporary phenomena that can affect space weather and solar activity.
Sunspots appear on the surface of the Sun, specifically in the photosphere. These darker, cooler areas are caused by magnetic activity on the Sun's surface. Sunspots can vary in size and shape and are often seen in groups.
A sunspot is a region on the Sun's photosphere that is cooler and darker than the surrounding material. Sunspots often appear in pairs or groups with specific magnetic polarities that indicate electromagnetic origins.
Even though sunspots are fiery white hot, they are somewhat cooler than the part of the Sun around them. When you inspect the Sun through a very dark filter (The only safe way) the Sun itself does not look very bright, and sunspots appear dark in comparison.
Sunspots are actually cooler regions on the sun's surface compared to their surroundings. They appear darker because they are areas of intense magnetic activity that disrupts the normal flow of heat to the surface.
This is because they are cooler.