There are several reasons why someone might use tyre dressing products on their vehicle:

To maintain appearance: Tyres are one of the most visible parts of a vehicle, and they can impact its overall appearance. Tyre dressing products, such as tyre shine or blackening agents, can help keep tyres looking new and shiny, improving the overall look of the vehicle.
To protect the tyres: Tyre protectants can help protect the rubber from UV rays, ozone, and other environmental elements that can cause damage over time.
To extend the life of the tyres: Regular use of tyre care products can help extend the life of the tyres by preventing cracking, fading, and other forms of damage.
To improve grip: Some tyre care products, such as tyre foam or gel, can help improve the grip of the tyres on the road, making the vehicle safer to drive in wet or slippery conditions.

In conclusion, using tyre dressing products on a vehicle can help maintain its appearance, protect the tyres, extend their life, and improve grip, making the vehicle safer and more attractive.