CPU, that's oftentimes called just "processor", is an abbreviation for Central Processing Unit. That is the core of each computer or server, due to the fact that it runs all of the calculations and logical input/output functions. Though the performance of an Internet site or an application depends on other things too, including the amount of physical memory or the connectivity of the hosting server, the rate at which a particular processor operates determines how quickly an application will be executed. Later-generation processors have a number of cores that can drastically boost their overall power and efficiency, since each and every core can take care of a variety of processes individually or a number of cores can deal with one process that requires a significant computing power. Due to the fact that each core runs at a specific speed, this architecture can be viewed as a number of separate processors cooperating.