CPU, that is sometimes called just "processor", is an abbreviation for Central Processing Unit. That is the core of every computer or hosting server, as it runs all of the calculations and logical input/output operations. Despite the fact that that the performance of a website or an application relies on other things also, like the amount of physical memory or the online connectivity of the server, the rate at which a certain processor operates determines how soon an app will be executed. Later-generation processors have several cores that can seriously improve their overall power and efficiency, as each core can take on a variety of processes individually or a few cores can take on 1 process that needs a sizeable computing power. As every single core runs at a certain speed, this architecture can be viewed as a number of independent processors working together.