Multiwell plates are a plastic tray with a cluster of wells typically, 24, 48, 96, 384 wells. Each well in the cluster are arranged in a rows and columns. Each well is used to add a number of items such as cells, chemicals, or other reagents. These multiwell plates are very commonly used to culture cells, do chemical reactions such as ELISA or PCR and they are known as cell culture plates, ELISA plates, or PCR plates according to their use.