Tamil inscriptions in Sri Lanka are like secret messages that are written in a language called Tamil. Tamil is a language that some people in Sri Lanka speak and write in. These messages were written a long time ago on rocks, walls, and other places that could be seen by people.
Sometimes people would write these messages to tell others about important things. They might write about a king or queen, a big battle or war, or some other event that was important in their culture.
Today, these Tamil inscriptions are like clues that help people understand more about the past history and culture of Sri Lanka. People who study history like to read these messages because they can learn about how people lived a long time ago and what was important to them. It's like being a detective and solving a mystery!