Microtubules are cylindrical structures made of protein subunits called tubulin. They are a key component of the cytoskeleton in eukaryotic cells, providing structural support and shape. Microtubules also play a crucial role in cell division, helping to separate chromosomes during mitosis and meiosis. In addition to their structural functions, microtubules are involved in intracellular transport. They serve as tracks for motor proteins, such as kinesin and dynein, which move cellular cargo along the microtubules. This transport system is essential for the proper functioning of cells, enabling the distribution of organelles and other materials.