what is GT cars? in urdu if possible?

GT = Grand Touring. Exactly the same thing as Grand Tourer and Gran Tourismo.

That originally meant a car which could be driven in reasonable comfort across the whole of Europe and the UK. 

So a car which had enough power to make long hill climbs, and enough torque to reduce the number of gear changes needed to avoid tiring the driver. It also meant a car big enough to carry lots of luggage and spare parts.

What it DID NOT mean was “sports car”. 

These days pretty much any new car will carry you across Europe and the UK in greater comfort and ease than any traditional GT car, but many lack luggage space. Most will also out-perform in every way what used to be called sports cars. 

So these days, GT is just a fancy badge which tends to be applied to the higher priced variants of many cars. 

On some cars it just means “metal roof”. For example, the classic MGB Tourer was an open top (=folding fabric roof) sports car (it actually wasn’t very sporty at all and the mechanical bits were largely from the same old Morris saloons of the 1950s which India re-made as the Hindustan Ambassador). But the same car was also made with a solid metal roof and a rear hatch and because it could carry more was named the MGB GT. Another example was the 1960s British sports car, the Triumph Spitfire. It was another open top car with a folding fabric roof, and again wasn’t really very sporty at all as it was mechanically almost identical to the Triumph Herald. But when they released a metal roof version with a rear hatch it was renamed the Triumph GT6. The 6 just meant the car had a 6-cylinder engine which was only possible because the metal roof made the car body stiff enough to take the extra power.

A modern equivalent is the Porsche Boxster. That is definitely a sports car. Porsche later released a metal roof version and were originally planned to call it the Boxster GT, but they realised that name was no longer special and was meaningless. So instead they called that car the Porsche Cayman instead. 

GT stands for Grand Touring, so it's a car for the road, not the drag strip ...........