Before we start installing and enabling modules, let's learn two important terms that you need to understand in PrestaShop's modules. They are as follows:
A hook is a place where the module code can be inserted. In the back office, hooks are shown in a block that comprises a few modules installed within it. As an example, the right column blocks is a hook, which is like a housing for the four modules (Cart block, New products block, Top seller block, and Specials block) as shown in the following screenshot. It is possible to change the order of these modules that have been placed within the hook.