ELI5: Explain Like I'm 5
Examples: interbank network, nuclear bomb, how does public key cryptography work?, leasing, bus

AC adapter

An AC adapter is an electric device that changes AC power into DC power, so it can be used to power things like phones, computers, and other electronic devices. AC power is the type of electricity that comes from your wall plug, and DC power is the type of electricity that is used inside the electronic device to actually power the electronics. AC adapters help you power your electronic device from AC power instead of having to use batteries.