An F-type giant star is a type of star that has expanded and cooled after exhausting the hydrogen in its core. These stars are typically larger and more luminous than the Sun, with surface temperatures ranging from about 6,000 to 7,600 degrees Celsius. They are often found in the later stages of stellar evolution, where they have moved off the main sequence. F-type giants are part of the Hertzsprung-Russell diagram, which classifies stars based on their brightness and temperature. Examples of F-type giant stars include Aldebaran and Procyon, both of which are visible from Earth and serve as important reference points for astronomers.