Okay kiddo, let me explain leakage in electronics to you like you're five.
Imagine you have a water bucket with a small hole at the bottom. When you fill it up with water, some of the water will leak out through the hole, even though you didn't want it to. That's kind of what happens in electronics when we talk about leakage.
In electronics, we use things called transistors, which are like special switches that help control the flow of electricity. When these transistors aren't functioning properly, some electricity can "leak" out through them, even when they're supposed to be "off" and not letting any electricity through. This can cause problems like wasting energy, making things hotter than they should be, or interfering with other electronic devices nearby.
So, to sum it up, "leakage" in electronics is when some of the electrical current that's not supposed to flow does so anyway, because the electronic components aren't working quite as they should be. It's like a water bucket with a hole in it - some of the water leaks out even when you don't want it to!