Okay kiddo, so a level sensor is like a special tool that helps us know how much of something is in a container.
Think about a cup filled with water. You can use your eyes to see how much water is in the cup. But imagine if the cup was really big and you couldn't see inside, how would you know how much water is in there? That's where a level sensor comes in!
A level sensor uses special technology to measure the height of something inside a container. It might use a laser, sound waves, or special sensors to do this. It then sends that information to a computer or machine so they can tell us how much of something is in the container.
Level sensors are used in lots of different ways. For example, they might be used in tanks to measure the amount of gas, oil, or water inside. They can also be used in factories to make sure the right amount of materials are being used to make things.
So, a level sensor helps us know how much of something is in a container when we can't see it with our own eyes! Pretty cool, huh?