Water is the foundation of life on Earth. Every living organism—plants, animals, and humans—depends on water for survival. Oceans regulate climate, rivers support agriculture, lakes provide drinking water, and groundwater sustains billions of people worldwide. Despite its importance, water is one of the most threatened natural resources today. Rapid population growth, industrial expansion, urbanization, and careless human behavior have led to widespread water pollution, putting ecosystems and human health at serious risk. Water pollution occurs when harmful substances such as chemicals, waste materials, or microorganisms contaminate water bodies, degrading water quality and making it unsafe for use. This pollution affects rivers, lakes, oceans, groundwater, and even drinking water supplies. According to global environmental studies, billions of people lack access to clean and safe water, and polluted water is a major cause of disease and death, especially in developing countries...