CPU, which is sometimes called just "processor", is an abbreviation for Central Processing Unit. This is the core of any computer or hosting server, because it performs each of the calculations and logical input/output operations. Despite the fact that that the performance of an Internet site or an app depends on other things as well, like the amount of physical memory or the connectivity of the web server, the pace at which a specific processor operates determines how fast a program will be executed. Later-generation processors have several cores which can considerably increase their overall power and efficiency, due to the fact that each and every core can take care of a number of processes independently or a number of cores can take on 1 process that requires a significant computing power. As each core operates at a certain speed, this architecture can be seen as a number of separate processors working together.