CPU, which is often called just "processor", is an abbreviation for Central Processing Unit. This is the core of every laptop or computer or server, since it executes each of the calculations and logical input/output functions. Although the performance of an Internet site or an app depends on other things as well, such as the amount of physical memory or the online connectivity of the server, the rate at which a given processor operates determines how quick an application will be executed. Later-generation processors have a number of cores that can considerably improve their overall power and efficiency, because each and every core can handle a variety of processes separately or several cores can take on one process that needs a considerable computing power. Since every single core runs at a particular speed, this architecture can be looked at as a number of individual processors cooperating.