# The hydrogen bond between two water molecules arises because water is what?

The water molecule is polar: i.e. ""^(delta+)H-O^(delta-)-H^(delta+) is a reasonable representation of this polarity, this charge separation.
Hydrogen bonding arises because of this polarity; i.e. alignment of the individual $O - H$ dipoles. This acts as an extra intermolecular interaction. Such hydrogen bonding also occurs where hydrogen is bound to other strongly electronegative elements, i.e. $H - F$, and $N {H}_{3}$ also exhibit some degree of polarity, and intermolecular hydrogen bonding occurs.