Platelet aggregation is the process by which platelets in the blood stick together to form a blood clot. It is a critical step in the body's natural response to injury and is essential for stopping bleeding and promoting wound healing. Platelet aggregation can be triggered by a variety of factors, including injury to blood vessels, inflammation, and the presence of certain molecules in the blood. Researchers study platelet aggregation to better understand the mechanisms and factors that regulate this process. This research can help in developing new treatments for conditions such as clotting disorders, heart disease, and stroke, as well as in improving the effectiveness of existing antiplatelet medications. Techniques used in studying platelet aggregation include aggregometry, flow cytometry, and microscopy.