Devices and smart home
Screen mirroring
In short and in plain language
Screen mirroring means a second screen shows what is on your phone.
With a television, this mostly works over your home network.
What you open on the phone then shows up big on the screen.
Definition
Screen mirroring means that another screen shows exactly what is currently on the phone or tablet. With a TV this usually works over the home Wi-Fi. Whatever you open on the phone then appears large on the TV.