What does "treadwear" indicate on a tire?

Treadwear refers specifically to the degradation of the tire surface that directly contributes to its ability to grip the road. Over time and with use, the tread on a tire wears down, affecting the tire's performance, particularly in wet conditions where adequate tread depth is important for traction. This degradation can lead to reduced handling ability, longer stopping distances, and an increased risk of hydroplaning. While other factors such as tread depth are important to consider for tire safety, treadwear addresses the overall condition of the tread material and its effectiveness in providing traction. Understanding treadwear is essential for assessing when to replace tires to maintain vehicle safety and performance.