Water (H2O) is a chemical compound of the elements oxygen (O) and hydrogen (H).
When we talk about water, we usually mean the liquid state of aggregation - while ice describes the solid and water vapor the gaseous state.
We encounter water everywhere. It covers two-thirds of the earth's surface and accounts for up to 70 (age-related) percent of our bodies.
Water is a common material, but by no means a boring element.
Water is the basis for life on earth.
What happens if we do not protect our water and what opportunities we have for having clean water around the world, you can read here.