Gihon spring is like a really big straw that brings water up from deep underground. It's like a secret well that's been around for thousands of years. People used to think it was magical because they couldn't figure out where the water was coming from. Today, we know that there are underground rocks that hold water and when the rocks crack, the water can come up to the surface. Gihon spring is one of those places where the water comes up and flows into a river. It's really important because people and animals need water to drink and to grow plants. So, Gihon spring is like a big drink for everyone around it!