A CPU and GPU are the most important components of a computer. When it comes to building a PC or buying a pre-built computer, the two main components that consumers should look out for are the CPU and GPU, and whether they are from Intel, AMD, or Nvidia. While most people would know what these abbreviations stand for, not everyone is aware of what these components actually do and how they affect the performance of the computer. So, let's dive into what a CPU and a GPU are, and how they differ from each other.