The primary function of a carbon sink is to absorb and store atmospheric carbon dioxide (CO2), thus mitigating climate change. Natural sinks, such as forests, oceans, and wetlands, play a critical role in sequestering carbon through biological processes like photosynthesis. By reducing the concentration of CO2 in the atmosphere, carbon sinks help stabilize global temperatures and contribute to maintaining balanced ecosystems. Protecting and enhancing these sinks is essential for climate change mitigation efforts and fostering ecological resilience.