Raman optical activity is like using a special flashlight to see how objects are moving. Just like a regular flashlight helps you see things in the dark, the special flashlight for Raman optical activity helps scientists see how molecules are moving in something called a "spectroscopy experiment."
When scientists shine the special flashlight on a sample, it bounces back in a certain way that tells us which parts of the molecule are moving and which ones aren't. Think about a ball bouncing back at you after you throw it against a wall. Depending on how it bounces back, you can tell if it hit the wall at an angle or if it hit it straight on.
By looking at how the beam of light bounces back from the sample, scientists can get a lot of information about the molecules it's made up of. They use this information to figure out the three-dimensional shape of the molecule and how it behaves.
This might not seem important to a 5-year-old, but scientists use Raman optical activity to help them understand how molecules work and how they can help us solve problems like diseases or making new materials. It's like using a special flashlight to see things that we can't see with our regular eyes.