CPU, that's frequently called just "processor", is an abbreviation for Central Processing Unit. That's the core of any computer or web server, due to the fact that it executes each of the calculations and logical input/output operations. Though the performance of a site or an application is determined by other things also, including the amount of physical memory or the online connectivity of the web server, the speed at which a certain processor works determines how soon an app will be executed. Later-generation processors have a number of cores that can seriously improve their overall power and efficiency, due to the fact that each core can handle a variety of processes independently or several cores can take care of a single process that requires a substantial processing power. Due to the fact that every single core functions at a particular speed, this architecture can be looked at as a few separate processors cooperating.