Which is enclosed within the CPU box
Answers
The answer to your question could be:-
Considering that you are talking about the hardware components of a computer, my answer is -
Internal hardware components are the hardware components which are enclosed within (fixed into) the CPU Cabinet.
The internal hardware components are different from external hardware components because the internal hardware components fit inside the CPU cabinet while the external hardware components are only attached to the CPU through the ports present on CPU Cabinet.
Examples of internal hardware components, for grasping the topic better, include Motherboard, Random Access Memory (RAM), Read-Only Memory (ROM), Central Processing Unit (CPU), Disk Drives such as Hard Disk Drives (HDDs), Compact Disks (CDs) and Digital Versatile Disks (DVDs) etc.