Moonlight is like having a special light that helps you see in the dark.
But instead of helping you see things in real life, Moonlight helps your computer show videos and animations that use a fancy type of programming called Silverlight.
Think of Silverlight as a way of making videos and animations that look really cool and work really well on websites. And Moonlight is like a tool that helps your computer understand and play those videos and animations, even if they were made with Silverlight.
So, when you visit a website that has a video or animation made with Silverlight, Moonlight helps your computer understand how to play it. Without Moonlight, your computer might not be able to understand the fancy programming used in Silverlight, and the video or animation might not work properly.