A cars wheels are designed to 'lean' slightly as you look at the vehicle. Look at a big person get into a Fiat 500 or Citroen 2CV and you will understand, the wheels sit level to the ground when the car is loaded up.
That is called 'camber' and is normally set in the steering and suspension mechanics. The other adjustable option is 'toe-in' or 'tracking'. This is when the wheels point toward each other more at the front of the wheel than the back. It is very minor and can not be seen by looking but by measuring with straight edges and lasers at the tyre shop. If this adjustment is 'out' the garage can adjust the length of a steering rod and set it correctly. Toe-in is often knocked out on smaller cars by hitting pot holes or clipping the curb.
Tracking, Camber and Toe in can all be checked by a garage.
A good mechanic can tell what is wrong by the wear on the tyres.
After having the 'tracking' or toe-in adjusted, the steering wheel is likely to need re-centreing. Most places don't bother and you will have to ask them to do it.
Unless the car is damaged, wheel alignment or tracking should not cost more than £40