What causes the clicking sound when starting the car and the engine not firing?

[MacMorgan]

Car starting with a clicking sound and failing to ignite may be due to insufficient battery power or low battery voltage. If you forget to turn off the car's headlights or there are too many electrical devices or external appliances connected before shutting down the engine, it can lead to battery drain. It's important to follow proper vehicle usage norms, ensuring all electrical devices are turned off before shutting down the engine. Another possible cause is an issue with the starter motor's carbon brushes. If the above two checks show no problems, you can remove the starter motor and have it inspected by a professional. There's no need to replace the entire starter motor assembly; simply replacing the starter motor's carbon brushes may suffice.