Reasons why your car won't start
The battery is dead: A dead battery is an annoyingly popular reason why a car won't start. Without this key electrical component.
The battery is dead: Many cars can still get away with a good old jump-start, but the method is not advised on some modern cars.
It may be a corroded battery terminal: If the battery has charge, then look out for any indication that the flow of electricity is being blocked.
It may be a corroded battery terminal: A corroded battery terminal will need to be cleaned before reattaching or replacing the cables.
There's a problem with the alternator: The alternator essentially distributes electricity to the car and recharges the battery.
There's a problem with the alternator: If you suspect the alternator may be the culprit, then get it checked out by a professional ASAP.
Your car is in gear: For your car to start, it needs to be in neutral or park.
Your car is in gear: If your car does start when it's in gear, or just in park or neutral (and not both), then you should get it checked out.
It might be a faulty fuse: Fuses protect the electrical wiring in vehicles, so if there is a faulty or blown one, your car won't start.
It might be a faulty fuse: If a fuse is damaged, it won't allow power to reach the starter relay, and consequently affects the ignition of the vehicle.