What kind of reaction adds water to break large molecules into subunits?

The answer to this question would be : Hydrolysis

Hydrolysis is made from two words, "hydro" that means water and "lysis" that means to unbind. Hydrolysis is a reaction to breaking down a big molecule into smaller molecule using water. It is the opposite of condensation reaction. One example of hydrolysis reaction would be when ATP turn into ADP to provide energy.