An ELISA plate is a flat, multi-well plate used in the Enzyme-Linked Immunosorbent Assay (ELISA) technique. Each well of the plate is used to immobilize a sample, typically an antigen or antibody, to capture the target molecule. The plate is usually made of polystyrene, which allows for easy binding of proteins, and it is designed for high-throughput screening and analysis in diagnostic and research applications.