ELISA (Enzyme-Linked Immunosorbent Assay) is a widely used technique for detecting and measuring specific proteins, peptides, or antibodies in various biological samples. It is highly valued in biotechnology for its sensitivity, accuracy, and ability to analyze multiple samples at once. ELISA works by using antibodies that specifically bind to the target molecule, followed by a reaction that produces a measurable color change. This makes it ideal for monitoring biomarkers, studying immune responses, and quality control of lab products. With its versatility and reliability, ELISA remains a key tool in modern biotech workflows.