Solar dark patch, also known as a SUNSPOT, is a region of the Sun's surface that appears darker than its surroundings due to a lower temperature. Sunspots are caused by intense magnetic activity and can last anywhere from a few hours to several months. They are often associated with solar flares, which are powerful bursts of radiation released from the Sun's atmosphere. Sunspots can have a significant impact on Earth's climate and can cause disruptions in communication systems.