What is gain?

Gain is when something gets bigger or stronger because it has help from another thing.

Imagine you're pushing a shopping cart. If you push it by yourself, it moves slowly. But if your friend joins in and pushes too, the cart goes much faster, that’s gain! The cart got more power because of your friend's help.

Think of gain like a loudspeaker. When you talk into a microphone, the sound gets bigger so everyone can hear it clearly. That bigger sound is the gain. Without the microphone, your voice might be too quiet for people to hear, but with it, your voice becomes louder and clearer.

You can find gain everywhere! A toy car that goes faster when you wind it up has gain from the winding. A balloon that floats higher because it’s filled with more air also has gain from the extra air inside. Just like you and your friend pushing the shopping cart together, anything that gets stronger or bigger with help is using gain!