Elongation refers to the process of lengthening or stretching an object. This can occur in various materials, such as metals, plastics, and rubber, when they are subjected to forces that pull them apart. The degree of elongation is often measured as a percentage increase in length compared to the original length. In the context of biology, elongation can describe the growth of cells or tissues, such as in plants where cells elongate to allow for growth in height. This process is essential for the development of structures like stems and roots, enabling plants to reach for sunlight and nutrients.