Stability tests are assessments conducted to evaluate how a product, such as a drug or food item, maintains its quality over time under various conditions. These tests help determine the shelf life and proper storage requirements, ensuring that the product remains safe and effective for consumers. Typically, stability tests involve exposing the product to different temperatures, humidity levels, and light conditions. The results guide manufacturers in making informed decisions about packaging, labeling, and distribution, ultimately ensuring that products like pharmaceuticals and cosmetics meet safety standards throughout their intended lifespan.