CPU, which is oftentimes called just "processor", is an abbreviation for Central Processing Unit. This is the core of any laptop or computer or web server, as it performs each of the calculations and logical input/output procedures. Although the performance of a website or an app is determined by other things also, such as the amount of physical memory or the connectivity of the web server, the rate at which a particular processor operates determines how quickly a program will be executed. Later-generation processors have a number of cores that can significantly boost their overall power and efficiency, because every core can take on a number of processes individually or a few cores can take on 1 process that needs a significant processing power. Due to the fact that every single core operates at a particular speed, this architecture can be looked at as a number of separate processors cooperating.