Meristematic tissue is a type of plant tissue responsible for growth. It consists of undifferentiated cells that can divide and develop into various types of specialized cells. This tissue is primarily found in areas of active growth, such as the tips of roots and shoots, where it contributes to the lengthening of the plant. There are two main types of meristematic tissue: apical meristem, located at the tips of roots and shoots, and lateral meristem, which is responsible for the thickness of stems and roots. These tissues play a crucial role in the overall development and regeneration of plants.