Treads are the horizontal parts of a staircase that you step on as you ascend or descend, thus, they form the surface of each step, providing the area where your foot lands. By supporting the weight of people using the staircase, treads are crucial for both safety and comfort. Properly installed treads ensure that the staircase is functional, allowing for safe and easy movement between levels. Additionally, the size, material, and finish of the treads play a significant role in the overall appearance and durability of the staircase.