Why heat is produce on adding water to quicklime?

When water is added to quicklime (calcium oxide), a highly exothermic reaction occurs, resulting in the production of calcium hydroxide (slaked lime). This reaction releases a significant amount of heat due to the strong bond formation between calcium ions and hydroxide ions. The heat generated can cause the water to boil and produce steam, illustrating the intensity of the reaction. This property is utilized in various industrial applications, such as in construction and chemical processes.