Flume is like a special funnel that helps move things from one place to another. Imagine you have a lot of little toys scattered around your room and you want to put them all in a toy box. Instead of picking them up one by one and carrying them to the box, you can use a funnel to make it easier. You put the funnel over the toy box and start dropping the toys in one by one. The funnel makes sure all the toys end up in the box without making a mess.
Flume works the same way, but instead of toys, it helps move data from one place to another. Let's say you have a lot of pictures on your phone and you want to save them on your computer. You can use Flume to move the pictures from your phone to your computer. The funnel in this case is the Flume program which takes the pictures from one device and sends them to the other. Like a real funnel, Flume makes sure all the pictures go where they are supposed to without getting mixed up or lost. This makes it easy to move your files around without having to do it all manually.