So what actually happens is two water molecules interact in such a way that one acts as a base and one act as an acid. So one donates H, and the other one accepts H, forming a conjugate acid and a conjugate base, namely hydronium and hydroxide. And this process of dissociation is called autoionization, where the auto basically means that two water molecules interact. And ionization means the dissociation of the two water molecules. Now, at equilibrium, reactants are favored. And that means equilibrium lies far to the left.