What is the reason for the Kia K3 not starting and making a clicking sound?

[OPenelope]

Kia K3 not starting and making a clicking sound is most likely due to a dead battery, or it could be because the car's voltage is insufficient. The reason for insufficient voltage is that the battery has been left unused for too long. If the headlights are functioning normally, then the issue might be with the protective coil inside the motor's magnetic switch being open, and replacing the motor's magnetic switch should resolve the problem. Yueda Kia, as Kia's joint venture brand in China, has made the K3 the third K-series model introduced under Dongfeng Yueda Kia. The K3 made its debut at the Chengdu Auto Show, equipped with the same powertrain as the Hyundai Elantra, featuring 1.6L and 1.8L engines. The all-new Dongfeng Yueda Kia K3 made its first appearance at the Shanghai Auto Show.