What causes a car to spin vs. going straight?

A car spins instead of going straight primarily due to a loss of traction between the tires and the road, often caused by factors like excessive speed, sudden steering inputs, or slippery surfaces. Oversteering, where the rear wheels lose grip before the front, can lead to a spin. Additionally, factors such as weight distribution and road conditions can influence a vehicle's stability and control. Proper driving techniques and maintaining tire health are crucial for preventing spins.