CPU, that is sometimes called just "processor", is an abbreviation for Central Processing Unit. That's the core of any personal computer or hosting server, as it carries out all of the calculations and logical input/output procedures. Even though the performance of an Internet site or an application is determined by other things too, such as the amount of physical memory or the connection of the hosting server, the pace at which a particular processor performs determines how fast an app shall be executed. Later-generation processors have numerous cores which can significantly boost their overall power and efficiency, since every core can handle a number of processes independently or a few cores can deal with 1 process which requires a significant processing power. As every single core runs at a specific speed, this architecture can be looked at as several individual processors cooperating.