Chemical reagents are substances used in chemical reactions to detect, measure, or produce other substances. They can be in various forms, including solids, liquids, or gases, and are essential in laboratories for experiments and analyses. Common examples include acids, bases, and indicators, which help scientists understand chemical processes. Reagents play a crucial role in fields like biochemistry, pharmaceuticals, and environmental science. They help in synthesizing new compounds, testing for the presence of specific elements, and conducting quality control in products. Proper handling and storage of chemical reagents are vital to ensure safety and accuracy in experiments.