CPU, that's oftentimes called just "processor", is an abbreviation for Central Processing Unit. That is the core of any laptop or computer or server, because it runs all the calculations and logical input/output procedures. Even though the performance of a website or an application is determined by other things also, including the amount of physical memory or the online connectivity of the hosting server, the pace at which a specific processor performs determines how fast an application will be executed. Later-generation processors have numerous cores which can significantly boost their overall power and efficiency, since every core can manage several processes individually or several cores can control 1 process which needs a considerable computing power. As every single core works at a certain speed, this architecture can be looked at as a number of independent processors working together.