| Keyword | Definition |
|---|---|
| CPU | Central Processing Unit which processes data |
| HDD | Hard Disk Drive which usually stores more than a solid state drive |
| Main memory | Stores instructions and data whilst a program is running (e.g. RAM) |
| RAM | Random Access Memory that stores instructions and data for programs currently running |
| Secondary storage | Stores instructions and data permanently (e.g. SSD / HDD) |
| SSD | Solid State Drive with no moving parts that is faster than a hard disk drive |