Electricity is a form of energy created by the movement of tiny particles called electrons. When electrons flow through a wire, they carry energy that can power lights, computers, refrigerators, and countless other devices we use every day.

You can't see electricity itself, but you see its effects everywhere: a glowing light bulb, a spinning fan, a phone charging on your desk. Inside the walls of your home, electricity flows through wires like water through pipes, ready to deliver power whenever you flip a switch or plug something in.

Electricity can occur naturally, too. Lightning is a massive burst of electricity jumping between clouds and the ground. Your body uses tiny electrical signals to send messages from your brain to your muscles, which is how you're able to move your fingers to turn a page or kick a soccer ball.

Understanding and harnessing electricity transformed human civilization. Before the late 1800s, people relied on candles, oil lamps, and fireplaces for light and heat. Today, electricity powers hospitals, schools, factories, and communication systems that connect the entire world. The ability to generate, control, and distribute electricity reliably is among humanity's most important technological achievements, changing nearly every aspect of how we live, work, and learn.