CPU, that's frequently called just "processor", is an abbreviation for Central Processing Unit. This is the core of each and every computer or web server, due to the fact that it performs all the calculations and logical input/output procedures. Even though the performance of a site or an application depends on other things too, like the amount of physical memory or the online connectivity of the web server, the pace at which a certain processor operates determines how fast a program shall be executed. Later-generation processors have a number of cores which can severely improve their overall power and efficiency, since every single core can control a number of processes separately or a few cores can handle a single process that requires a sizeable computing power. Due to the fact that every core functions at a particular speed, this architecture can be seen as numerous independent processors cooperating.