The chemical element represented by the symbol 'C' is carbon. Carbon is a nonmetal and is essential for life on Earth as it is a fundamental building block of all organic molecules, including carbohydrates, proteins, and nucleic acids. Its ability to form stable bonds with various elements allows for the complexity and diversity of life. Carbon exists in several allotropes, including graphite, diamond, and amorphous carbon. Additionally, carbon plays a significant role in the carbon cycle, which is crucial for maintaining the Earth's ecosystems and regulating climate.