Eicosanoids are signaling molecules derived from fatty acids, particularly arachidonic acid, which is found in cell membranes. They play crucial roles in various physiological processes, including inflammation, immune responses, and blood clotting. Eicosanoids are classified into three main groups: prostaglandins, thromboxanes, and leukotrienes, each with distinct functions in the body. These molecules are produced in response to cellular stimuli and act locally, meaning they affect nearby cells rather than traveling long distances in the bloodstream. Due to their significant impact on health, eicosanoids are often studied in relation to conditions like asthma, arthritis, and cardiovascular diseases.