What are the hotter and cooler points on the sun called?

The hotter points on the Sun are called sunspots, which appear darker because they are cooler than the surrounding areas. The cooler regions within sunspots can reach temperatures around 3,000 to 4,000 degrees Celsius, while the hotter areas of the Sun's surface, or photosphere, are about 5,500 degrees Celsius. Additionally, the Sun's core is the hottest part, with temperatures reaching around 15 million degrees Celsius, where nuclear fusion occurs.