A Caspase Activity Assay is a laboratory technique used to measure the activity of caspases, which are a family of enzymes playing a crucial role in programmed cell death, or apoptosis. This assay typically involves the use of specific substrates that release a detectable signal, such as fluorescence or color change, when cleaved by active caspases. Researchers use this assay to study various biological processes, including cell development, immune responses, and disease mechanisms. By quantifying caspase activity, scientists can gain insights into the regulation of apoptosis and its implications in conditions like cancer and neurodegenerative diseases.