When you turn the steering wheel and hear a popping noise, it could be due to the Power Steering pump and a sticking valve so there is not enough hydraulic pressure. It could be caused by the steering linkage going out or low power steering fluid.
The wheel has a whole in it.
Check the fluid in the power steering. If it is low the car will make noise when you turn the wheel.
probably the cv joints
check your power steering fluid
Power steering or wheel bearing?
You probably need new tie rods on that side. have someone turn the wheel and check to see if you have in play any where.
Power Steering?
Usually it is a warning sign of your wheel bearing going bad.
It is very hard to turn the steering wheel and/or a whining or squealing noise when you turn the steering wheel.
CV joints (constant velocity joints) get them replaced or you're gonna be in trouble real soon. Not very expensive to replace.
If a car makes noise when turning the tie rod can be worn. Tie rods allow a vehicle to turn, when they fail the steering wheel will knock and rattle making all kinds of noises.
If you mean "what" is making noise when you turn the steering wheel? It usaually means you need power steering fluid. If you run too long without power steering fluid it will make your power steering go out. If it is making a shuttering noise when you take sharp turns. Your rear differential may need to be serviced. I would have is burnished.