Pollution occurs when harmful substances contaminate the environment. There are six main types of pollution: air, water, noise, land, radioactive, and soil. Various human activities like industry, transportation, agriculture, and waste dumping can pollute the air with gases, water with chemicals, land with trash and debris, soil with toxic materials, and introduce radioactive and noise pollution. Pollution has wide-ranging negative effects on human health, ecosystems, and the atmosphere. Reducing pollution requires changes like using renewable energy, sustainable farming, proper waste disposal, and raising awareness.