No, H2O itself is not a hydrogen bond, but it can form hydrogen bonds with other molecules due to its structure.
Water (H2O) consists of two hydrogen atoms covalently bonded to one oxygen atom. The oxygen atom has a higher electronegativity than the hydrogen atoms, leading to a polar molecule where the oxygen end has a partial negative charge and the hydrogen end has a partial positive charge. This polarity enables the formation of hydrogen bonds between water molecules.
A hydrogen bond is an attractive force between a hydrogen atom, which is covalently bonded to a highly electronegative atom (like oxygen, nitrogen, or fluorine), and another electronegative atom. In the case of water, the hydrogen bonds occur between the hydrogen atoms of one water molecule and the oxygen atoms of neighboring water molecules. These hydrogen bonds are responsible for many of water’s unique properties, such as its high surface tension, boiling point, and ability to dissolve various substances.