What is meant by a 2.8GHz CPU?

A 2.8GHz CPU refers to a central processing unit that operates at a clock speed of 2.8 gigahertz, meaning it can perform 2.8 billion cycles per second. This speed indicates how quickly the CPU can process instructions, impacting the overall performance of a computer. Higher clock speeds typically allow for faster data processing, although other factors like the CPU architecture and core count also significantly influence performance.