CPU (Central Processing Unit) is your computer's main processing chip — the part that actually carries out the instructions behind every app you open. If the storage is the cupboard and RAM is the worktop, the CPU is the chef doing the work.
Two numbers you'll see
- Cores (and threads): the number of independent work lanes. A 4-core CPU can do four things at once. Modern home PCs commonly have 4–16 cores.
- Clock speed (GHz): how fast each core works, in billions of cycles per second. Roughly, higher is a bit faster for single tasks — but cores matter a lot for multitasking.
Do you need to know the model?
For everyday use you don't need to chase a specific model. What matters is that it's a modern CPU (roughly the last 5–6 years) and that it has enough cores for what you do. A 5–6 year old CPU is still fine for web, office, and video.
If your PC feels slow but the CPU isn't pegged at 100% in Task Manager, the CPU usually isn't the bottleneck — look at the drive (SSD) and RAM instead.