What is the difference between AC/DC adapter?

Most countries use alternating currents  - know as AC. DC stands for direct currents. All appliances and voltage transformers run only on AC electricity.

AC: This refers to alternating current and is the most common type of power supply. This power is generated by a utility company and sent along cables to power outlets.

DC: This refers to direct current and is the type of power supply required by an electronic device. The output information on the device's power supply label will tell you what it runs on.

Example: OUTPUT DC 1.2V 2.3A

This is usually important only if you need to replace a lost AC adapter. In this case, a replacement AC adapter must match the manufacturer's recommendation for your device.