Label-Free Detection (LFD) is a technique used for discovering biomolecules and their interactions. This method has emerged as an attractive research and development tool in the pharmaceutical and biotech industry. Label-free technology uses impedance- or optics-based biosensors to measure the changes upon analyte binding to a ligand immobilized on a biosensor surface. This approach enables the interaction to be monitored in real-time without manipulating the individual assay components artificially. A defining feature of label-free technology is the method used for ligand immobilization.