When we add sodium chloride chloride into water, it dissociates into two ions, sodium and chloride. Now, this reaction is called the forward reaction or dissolution. The reverse reaction is just as likely to occur, and that's called precipitation, the sufformation of ionic compound from its ion form. Now, initially, when we add photos chloride into water, the forward rate is much higher than the reverse rate. Eventually, however, though dynamic equilibrium is achieved, at this point, the forward rate is equal to the reverse rate. And at this point, the solution is said to be saturated, which basically means that the concentration of the ions or dissolved ions is that it's maximum.