CPU, that's frequently called just "processor", is an abbreviation for Central Processing Unit. This is the core of any laptop or computer or server, since it executes each of the calculations and logical input/output procedures. Although the performance of a website or an application is determined by other things too, including the amount of physical memory or the connection of the web server, the speed at which a particular processor runs determines how quick a program shall be executed. Later-generation processors have numerous cores that can drastically boost their overall power and efficiency, because every core can take care of numerous processes individually or a few cores can take on a single process that needs a sizeable processing power. As every core operates at a specific speed, this architecture can be seen as several individual processors cooperating.