Can I record the voice when I record my screen on Mac mini?

mattifromtampere wrote:

... but recording the voice with an outer microphone also comes with around all the noise in the recording.

The Mac mini has no built-in microphone, so you have to use an external device for audio. Noise is likely to be captured unless you are recording in a very quiet or studio environment where noise can be controlled or recording with a noise rejecting mic.

An option would be to record the screen and then edit the video and add narrative audio afterward. Still, the noise in the recording environment would need to be controlled.

Yes, screen recordings can include audio if you have a mic or headset connected to the Mac mini.

You can find guidance for that here: Take screenshots or screen recordings on Mac - Apple Support