CPU, that is sometimes called just "processor", is an abbreviation for Central Processing Unit. That's the core of each personal computer or hosting server, due to the fact that it runs all of the calculations and logical input/output procedures. Despite the fact that that the performance of a website or an application relies on other things also, including the amount of physical memory or the online connectivity of the web server, the rate at which a certain processor runs determines how soon a program will be executed. Later-generation processors have a number of cores that can seriously boost their overall power and efficiency, as every single core can control a variety of processes individually or several cores can handle one process which requires a considerable computing power. As every single core works at a specific speed, this architecture can be viewed as a few separate processors working together.