Can I use the M1 iMac as an external display for the MacBook Pro 14" by USB-C?

The very restrictive hardware and software requirements for Target Display Mode (TDM) are laid out in this Apple document:

Use your iMac as a display with target display mode - Apple Support

Both your computers and their OS versions are far too new. Apple started the deprecation of TDM in late 2014 and threw the last shovel of dirt in its face in early 2020.

Rajp_10 wrote:

I want to connect the MacBook Pro (2021) to the iMac (2020) as second monitor by cable or dongle. Is it possible? Both computer have the last version of macOS Monterey.

Since you are running Monterey on both Macs you can Airplay your MacBook Pro to your iMac.

"AirPlay content to your Mac.

Use AirPlay to send content to your Mac from an iPhone, iPad, or even another Mac."

From: macOS Monterey - New Features - Apple

Here's a screen shot for you…

Welcome. You can reduce the latency by connecting the two with a USB cable but I don't think you can eliminate it altogether. I've only played with it over Wi-Fi. It's not a feature I have any use for.

No.

Prefect! Thank you very much!

+1 No. If you need an external display then it is time to buy one. There are no work arounds however there are third party software solutions. These tend to be expensive so my recommendation is to get yourself an external display which is far more reliable and simple to set up.

Good luck.

Thanks for posting that, dialabrain. I was looking for a KB article because I thought Airplay might work, but found nothing. Have you seen a link I can bookmark other than the "what's new" article?

Welcome. There are a few but of course I never bookmarked them. lol

Here's one though: https://eshop.macsales.com/blog/79479-how-to-use-airplay-to-mac-in-macos-monterey-2/

You're welcome.