It's a piece of wire to join things together.
cable
You push this into the wall to connect to the power supply.
plug
You use this to put more electricity into your phone.
charger
You use these to listen to music so that no one else can hear.
earphones
It's a small, flat computer you can hold in your hands.
tablet
You use this to take a photo of yourself.
selfie stick
You put this inside the camera or other piece of technology to make it work.
battery
This is the part of a device where the sound comes out.
speaker