Reagents are substances or compounds that are used in chemical reactions to detect, measure, or produce other substances. They play a crucial role in laboratories and industrial processes, helping scientists and researchers understand chemical properties and reactions. Common examples of reagents include acids, bases, and indicators, which can change color to signal a reaction. In many experiments, reagents are mixed with samples to observe changes, such as color shifts or gas production. This helps in identifying the presence of specific compounds or in synthesizing new materials. Proper handling and storage of reagents are essential for safety and accuracy in experiments.