The tyres on your car will not last forever. As you drive along, the rubber on your tyres will begin to wear down due to the friction created by the contact with the road surface. Driving with worn tyres, it can be extremely dangerous. I didn't know about any of this until I took my car to be serviced. The mechanic examined the tyres and said that they were very worn. He recommended that I replace the tyres and talked me through the different options that I had. I learnt a great deal from him and I am really pleased with my new tyres.