What should be checked if an iPhone is not charging?

If an iPhone is not charging, checking the lightning cable and power adapter is essential because these components are critical for the charging process. The lightning cable transfers power from the adapter to the iPhone, and if it is frayed, damaged, or not functioning correctly, the device will not receive power. Similarly, the power adapter must also be operational and compatible with the iPhone; a faulty adapter or one that does not provide sufficient wattage can prevent the device from charging. Ensuring that both the cable and adapter are in good condition and properly connected can help diagnose and resolve charging issues effectively.