CPU, which is sometimes called just "processor", is an abbreviation for Central Processing Unit. This is the core of every computer or server, as it performs all of the calculations and logical input/output functions. Though the performance of a website or an application is determined by other things as well, such as the amount of physical memory or the connection of the hosting server, the speed at which a given processor operates determines how soon an app will be executed. Later-generation processors have multiple cores which can considerably boost their overall power and efficiency, due to the fact that every single core can take on a variety of processes independently or several cores can control a single process that needs a significant processing power. Because each and every core functions at a particular speed, this architecture can be seen as several individual processors working together.