A wireless phone charger feels a bit like magic, but it is really just smart use of electricity and magnets.

Inside the charging pad is a flat copper coil. Inside your phone is another flat copper coil. These coils are very close to each other when you place your phone on the pad. They do not touch, but that is okay. When you plug the charger into the wall, electricity flows into the coil inside the pad. This electricity moves back and forth very fast. When electricity moves like that, it creates an invisible magnetic field around the coil. You cannot see it, but it is there.

A tin can phone is a simple way to send sound using nothing but two cans and a string. It feels like magic, but it is really just sound and movement working together.

A walkie talkie is a small radio you can talk into. It lets two people speak to each other without wires. It works using radio waves that travel through the air.

Bluetooth is a way for devices to talk to each other without using wires. It is used by things like headphones, speakers, keyboards, mice, phones, watches, and cars. It works over short distances and is made to be simple and low power.

WiFi is a way for devices to talk to each other without wires. It uses invisible waves that travel through the air, kind of like sound, but much faster and silent. These waves are called radio waves. They are the same type of waves used by radios and walkie talkies.