Explants are small pieces of tissue taken from a plant or animal for scientific study or cultivation. In plant biology, explants can be used in tissue culture to grow new plants under controlled conditions. This method allows researchers to propagate plants that may be difficult to grow from seeds or cuttings. In medical research, explants refer to tissues removed from a living organism, often during surgery, for examination or testing. These samples can help scientists understand diseases, test new treatments, or study the effects of medications on specific tissues. Explants play a crucial role in advancing both plant science and medical research.