Electromagnetic interference

Electromagnetic interference (EMI) happens when an electric or magnetic signal from one device affects the way another device works. It's like a game of tag: when two signals bump into each other, it can cause problems for the devices these signals are coming from. For example, if your TV is too close to your phone charger, your TV might get blurry or have scrambled sound. That's because the signal from the phone charger, which is a mix of electric and magnetic signals, is interfering with the signal from the TV.