F-type giant stars are large, luminous stars that have moved off the main sequence in their life cycle. They are typically yellow-white in color and have surface temperatures ranging from about 6,000 to 7,500 degrees Celsius. These stars are significantly larger than the Sun, often having radii up to 10 times greater, and they can be several times more massive. As they evolve, F-type giants expand and cool, becoming redder over time. They are often found in clusters and can be studied to understand stellar evolution. Notable examples of F-type giants include Aldebaran and Pollux, which are prominent in the night sky.