What is contamination and its types?

Contamination refers to the presence of harmful substances or impurities in a medium, such as air, water, or soil, which can adversely affect health, ecosystems, or the quality of goods. The main types of contamination include chemical contamination (involving pollutants like heavy metals or pesticides), biological contamination (involving pathogens such as bacteria or viruses), and physical contamination (involving foreign objects or materials). Each type poses distinct risks and requires specific methods for detection and remediation.