What really is wrong with your car if it is "pulling" to one side?

Their are number of reasons if your car is pulling:
First and foremost you must check the wheel alignment.
But what if even after alignment, your car is still moving? Nobody knows and nobody's going to tell you.
But I will.
First of all check the air pressures of the tyres & then take a test drive.
At times the pulling is due to imbalance of air pressure in right and left tyres. E.g,  If in the left side, tyre pressure is 30 psi and on the other side the pressure is 15 psi, your car will obviously pull towards the side which has less pressure.
But still if the problem persists,
Check the front tyres of your car. Are they equally worn?.
At times the car moves to the side which has tyre that is more worn. If both your front tyres are not equal, make them even by changing the side or by checking the rear tyres. Rear tyres are mostly equal, so you can rotate both the tires to front.
Your problems will definitely be solved.

In case you still face similar problem, feel free to contact me @ sumra.automobiles@gmail.com.