Coral bleaching is a phenomenon in which coral reefs lose their vibrant colors and turn white due to environmental stress, such as elevated water temperatures, pollution, or disease. This stress causes the coral to expel the algae living within their tissues, which normally provide them with nutrients and color. Without these algae, the coral become weakened and more susceptible to disease, ultimately leading to their death if the stress is prolonged. Coral bleaching is a significant threat to coral reef ecosystems around the world, as it can result in declines in biodiversity, loss of habitat for marine life, and negative impacts on fisheries and tourism industries. Researchers are studying the causes and consequences of coral bleaching, as well as working to identify strategies for conservation and management to protect these valuable ecosystems.