Root hairs are tiny, hair-like structures that grow from the roots of plants. They increase the surface area of the root, allowing the plant to absorb more water and nutrients from the soil. Root hairs are essential for the plant's growth and overall health, as they help in the uptake of vital minerals. These structures are typically found near the tips of roots and are short-lived, often dying off as the root grows. The presence of root hairs is crucial for the plant's ability to thrive in its environment, making them an important part of the plant root system.