Envelope tracking is like a mommy making sure you eat just enough food, neither too little nor too much, by giving you just the right amount of food each time you eat.
In the same way, when your phone or any electronic device sends out signals to connect to the internet or make calls, it needs some electricity. Envelope tracking is a technology that makes sure the phone gets just the right amount of electricity it needs to connect to the internet or make a call - neither too much nor too little.
So, envelope tracking ensures that the phone's signal is strong enough to do what it's supposed to do, but not too strong that it wastes energy or interferes with other signals nearby. It basically helps your phone save battery while still working perfectly fine!