The chemical element essential for human life that has the symbol "C" is carbon. Carbon is a fundamental building block of life, as it is a key component of DNA, proteins, carbohydrates, and lipids. Its unique ability to form stable bonds with a variety of elements enables the complexity of organic compounds. Carbon compounds not only comprise the structural framework of living organisms but also play critical roles in cellular processes, energy transfer, and biochemical reactions. Additionally, carbon occurs in various forms, such as graphite and diamond, highlighting its versatility and significance in both biological and non-biological contexts.