CPU, which is frequently called just "processor", is an abbreviation for Central Processing Unit. That's the core of each and every personal computer or hosting server, because it performs all the calculations and logical input/output procedures. Despite the fact that that the performance of an Internet site or an app relies on other things as well, like the amount of physical memory or the connectivity of the web server, the rate at which a particular processor works determines how quick a program shall be executed. Later-generation processors have several cores that can drastically improve their overall power and efficiency, since each core can take on a number of processes individually or a number of cores can take care of a single process which requires a substantial processing power. Because each and every core runs at a specific speed, this architecture can be viewed as several individual processors working together.