You've probably heard that the brain is like a computer. Well, it's not or rather, it's not just like a computer. The brain has processing capacity and does everything computers can't, like making decisions and feeling emotions. The two have some similarities: both have memory units and processors that work together to carry out tasks and store information. Both use electric signals to communicate with each other. Both have inputs (things you see, hear, smell and feel) and outputs (something you say or write). When it comes to computers, the CPU is the brain of your machine. The CPU is a chip installed on a computer's motherboard determining the hardware device's computing speed. The central processing unit is an integral part of any computer. It ensures that all your files, applications, and programs are processed quickly. The two most common ways to measure CPU processing capacity are Megahertz (MHz) and Gigahertz (GHz). Professionals talk about clock speed, which is the standard ability of the CPU to cycle through its operations over time. It is important to note that clock speeds are only condition-optimal estimates of processor capacity. Other issues like bottlenecks or environmental factors can decrease or change processor capacity in actual operations and hardware use. The bottom line is this: if you're looking for a new computer, you must consider how much memory your CPU has and how fast it can process information. Looking at the evolution of processor speed and capacity, it's hard to believe that, in the beginning, they measured them in megahertz (MHZ). Now we're talking about processing speeds approaching 1 GHz and up to several gigahertz. As computing power has increased, so have operating system complexity and other major evolutions in IT. It has led to a need for more powerful processors.