How is this done?
Have they connected another microphone right beside their computers speakers?
Although this can be done, it is not an ideal situation.

This is where Stereo Mix comes into play.
This feature comes with the most common Realtek audio cards.
The Windows OS perceives this as a (virtual) sound recorder.

Stereo Mix allows you to record everything coming out of your computers audio.
However, Stereo Mix has often disappeared from the sound tweaks in Windows.
Let us see how we can address this issue.

Often, the Sound controls on your Windows PC hide the disabled items.
Now right-click onStereo Mixand clickEnable.Enable Stereo Mix
Stereo Mix will now be displayed and enabled.
However, Windows Updates also provide drivers from OEMs.

you’ve got the option to thus search for the latest audio driver for your Realtek sound cardautomatically.
Now clickSearch automatically for drivers.Search for drivers
Windows will now search for an updated driver online.
If one is available, it will automatically be installed.
However, if one is not available, you will be informed thusly.
Either way,Closethe update wizard.
Some codecs contain only the encoder, some only the decoder, and some comprise both.
Missing codecs on your system can result in an absent Stereo Mix.
OpenRealteks High Definition Audio Codecs websiteusing anyweb internet tool.
When the download completes, launch the file to begin the installation and follow the instruction in the wizard.
Once installed, restart the computer for the codecs to implement successfully.
Now re-check whether the Stereo Mix option inside the Sound applet has been restored.
Then, hit it and then clickSet Default.
If your input devices volume is low, then the recording volume will be low.
This tool is especially useful for streamers, YouTubers, and Twitch users.
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source: www.itechtics.com