The word **"tubeless"** on the side of a tire indicates that it is a tire designed to be mounted **without an inner tube**. This means that the tire fits directly onto the rim, forming an airtight seal that retains the air.

- Tubeless tires are an evolution of tires with tubes, eliminating the need for an internal tube. This reduces the risk of punctures and improves safety, as the air does not escape quickly in case of a puncture.

- It is important that tires, including tubeless ones, are in **good condition** and meet the necessary quality characteristics to prevent accidents. They should be checked regularly to ensure they have no deformations, breaks, or excessive wear.

- The **tread** of the tires should have adequate grooves to improve grip and remove water in rainy conditions, but this is not related to the "tubeless" feature.

In summary, a "tubeless" tire is one that does not require an inner tube, making it safer and more efficient.