Okay, so imagine there's a secret, magical pool of water in the ground. It's super special because people think it can do special things like heal people who are sick or make their wishes come true. This is what we call a holy well!
People have been coming to these special wells for a very long time - even before people had modern doctors! They would go to the well and pray, sing, or leave offerings like flowers or coins. They believed the water in the well was blessed by a saint or some other powerful spirit, and that it had special powers to make things better for them.
Nowadays, not everyone believes in the powers of holy wells, but some people still come to visit them out of historical interest or because they think it's a peaceful and calming place to be. Some holy wells are still even used for religious purposes and may have a chapel or shrine nearby.
Just like any other natural water source, it's important to keep holy wells clean and protected so that they can continue to be enjoyed by people for years to come.