Stagnant water refers to water that is not flowing or moving. This type of water can be found in ponds, puddles, or any area where water collects and remains still. Because it lacks movement, stagnant water can become warm and may develop a layer of algae or other organic matter on its surface. Stagnant water can pose health risks as it may become a breeding ground for mosquitoes and other insects. Additionally, it can harbor bacteria and pathogens, making it unsafe for drinking or swimming. Proper drainage and water management are essential to prevent stagnation and its associated problems.