The chemical formula H2O represents which substance?

The chemical formula H2O specifically represents water, which is composed of two hydrogen atoms covalently bonded to one oxygen atom. This simple yet crucial molecule is fundamental for life and is known for its unique properties, including its ability to dissolve other substances, its relatively high boiling and freezing points, and its role as a solvent in biological systems. Understanding the significance of water in various chemical and biological processes underscores its importance as the most recognizable substance associated with the formula H2O.