The tyres are an important part of your car’s setup, and it is important that you maintain your tyres to get the best wear from them. You should check regularly that they are pumped up to the right pressure level for the style of driving you are doing. If you tend to do lots of fast motorway driving, you will need them to be pumped up differently to someone who takes a large family out occassionally on country roads!
Another test to perform regularly is that of the tread depth. The treads help the car to grip the road surface, and there are legal limits to the depth of treads for safety. The minimum depth should be 1.6mm. You can measure yourself, or take your car to a garage where they can check for you.