How is the rate of reaction influenced by a catalyst? how do catalysts make this possible?

            The rate of reaction increases when the reaction is catalyzed by using catalyst.

Explanation:
                   Catalyst is a specie which when involved in reaction, speeds up the reaction without consuming itself. The catalyst is regenerated at the end of reaction and is recovered in good yield. Catalyst main role in reaction is to decrease the Activation energy of the reaction. This decrease in activation is achieved through different mechanisms. Without going in detail, they are as follow,
                  1) By providing different pathway to reaction

                  2) By weakening the bonds

                  3) By providing surface area to reactants