Imagine you have a bunch of little balls (called atoms) that make up everything around us, including water. The atoms that make up water are called hydrogen and oxygen. They stick together to make a molecule (a group of atoms) that looks like Mickey Mouse ears - with two hydrogen atoms for ears and an oxygen atom for a face.
When we talk about a water model, we are trying to explain how the water molecule behaves or works. One popular model is called the "ball-and-stick" model. It uses little balls (representing the atoms) and sticks (representing the bonds between the atoms) to show us how the water molecule is put together.
But why do we care about the water model? Understanding how water works helps us understand how it interacts with other things. For example, we know that water is a key ingredient for life and that it can dissolve certain substances. We also know that water expands when it freezes, which can be helpful for things like ice skating.
So, in summary, a water model is a way to help us understand how the water molecule is put together and how it behaves in different situations. It may use little balls and sticks to represent the atoms and the bonds between them. Understanding the water model can help us understand how water interacts with other things and why it behaves the way it does.