An understeered car turns less than you want it to and strives to go straight ahead in curves. This is because the front tyres do not have enough grip.

Most modern private cars, especially those with front-wheel drive, are somewhat understeered as that is considered the safest. This is because understeering requires less of the driver than oversteering. But if a car for some reason understeers too much, the car will become very difficult to safely manoeuvre.

Read more about understeering and oversteering