CPU, which is sometimes called just "processor", is an abbreviation for Central Processing Unit. That's the core of any personal computer or server, due to the fact that it executes all of the calculations and logical input/output procedures. Despite the fact that that the performance of an Internet site or an app depends on other things also, such as the amount of physical memory or the connection of the hosting server, the pace at which a particular processor works determines how soon an application shall be executed. Later-generation processors have numerous cores which can considerably increase their overall power and efficiency, since every core can take care of several processes separately or several cores can handle one process which needs a significant computing power. As every core works at a certain speed, this architecture can be viewed as several individual processors cooperating.