CPU, which is frequently called just "processor", is an abbreviation for Central Processing Unit. This is the core of any PC or hosting server, since it executes each of the calculations and logical input/output operations. Even though the performance of a website or an app is determined by other things too, like the amount of physical memory or the connection of the hosting server, the pace at which a certain processor runs determines how soon a program shall be executed. Later-generation processors have a number of cores that can drastically increase their overall power and efficiency, because each core can handle several processes independently or a number of cores can control 1 process that needs a substantial processing power. Because each and every core operates at a certain speed, this architecture can be looked at as several individual processors working together.