Wow. A great question, but one that is so broad that it's not possible to provide a good answer on an answer board such as this. I'll try to give the best answer I can but you should use Google Search, Youtube, and Wikipedia to get more details.
Electricity is everything from lightning during a thunderstorm, the alternating current (AC) electricity that comes into your home to run your TV, your appliances, computers, and cell phone chargers -- to the direct current (DC) electricity from batteries that runs your phone, flashlights, car, and cameras. It's ALL electricity -- a special kind of energy that is usually distributed by wires or connectors, although sometimes wirelessly.
When you get into high school, take a Physics course, and learn more about how electricity is related to atomic free electrons and how there are positive and negative charges, and how they flow in conductors to do work, like turn motors, illuminate lights, charge your cell phone, start your car, and power your TV.