CPU is an acronym for Central Processing Unit, also referred to as the processor. You can find out more about it over at
Wikipedia.
Generally when building a desktop, you need to consider all of the components however, most actually focus on CPU, RAM (also referred to as memory) and GPU (graphics card.) Those three will definitely affecting gaming performance, or simply performance overall.
We don't actually build laptops however, they are pre-assembled when we purchase/receive them. We can however in certain cases upgrade specific components on a laptop. The most common replaceable parts on a laptop are the battery, HDD/SSD (your storage device, acronym for Hard Disk Drive and Solid State Drive respectively) and RAM. In rarer cases, you may also be able to upgrade the CPU, and in the most extraordinary of cases, you may also be able to upgrade graphics (MXM cards.)
If you want to find out what processor is in your laptop, left-click on the Windows start/orb at the bottom left hand corner of your screen. Thereafter right-click and select "Properties" whilst your cursor is hovered over "Computer" on the right hand side of the start menu. A new pop-up window will state which processor you have inside your laptop, below your Windows Index Rating.
If you want more details about your CPU, you may download and run
CPU-Z.
All the best.
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