G-dwarfs, or G-type main-sequence stars, are a category of stars that have a surface temperature between 5,300 and 6,000 degrees Celsius. They are often yellow in color and are known for their stable energy output, which allows for the development of planets and potential life. Our own Sun is a prime example of a G-dwarf star. These stars typically have a lifespan of around 10 billion years, spending most of their life in the stable phase known as the main sequence. G-dwarfs fuse hydrogen into helium in their cores, providing a consistent energy source. Their characteristics make them important for understanding stellar evolution and the conditions necessary for life.