This has been answered many times. Click here to see the related questions and answers. To sum them up, sunspots are areas of significantly reduced temperatures on the Sun’s photosphere. In addition, they are magnetically active.
A sunspot is simply an area of the sun with a different temperature than the rest of the Sun. The average temperature across the Sun’s surface is 5,800 Kelvin, while the average sunspot ranges in temperature from 5,000 to 6,500 Kelvin. The sunpsot is visibly darker in appearance compared to the rest of the Sun.
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