Quite simply, if your car won’t start when you turn on the ignition, you may have a flat or dead battery.
If you haven’t started the car in a while, you may be able to recharge it, jump start it from another car, or get a breakdown service to start it for you - but if you find it going dead more often, then you may need a new one.
If you’ve noticed that the car is struggling to start or you’re seeing any warning signs on the dashboard, it’s worth getting a checkup at the garage to check if there are any underlying problems that are draining your battery before you replace it.