A Cell Viability Assay is a laboratory technique used to determine the health and survival of cells in culture. This assay measures the ability of cells to grow and divide, providing insights into the effects of various treatments, such as drugs or toxins, on cell health. Common methods include using dyes that indicate live or dead cells, such as MTT or Trypan Blue. These assays are essential in research and drug development, helping scientists evaluate the efficacy and safety of new compounds. By assessing cell viability, researchers can better understand cellular responses and optimize therapeutic strategies in fields like cancer research and pharmacology.