need to play comercial DVD's on my M4 chip imac

You'll need an external optical drive to do that.

Apple's own DVD Player application will play commercial DVDs, provided you supply a compatible optical drive. The DVD Player app is installed as part of macOS and is located in your Mac at

Macintosh HD/System/Library/CoreServices/Applications. Typically the application will launch when you insert a DVD into a connected and working optical drive. DVD Player User Guide for Mac - Apple Support

Apple no longer sell their own SuperDrive optical drive, but you can find may relatively inexpensive drive is you search Amazon or google it with your browser. Many here will recommend the optical drives from OWC/macsales.com.

Some drives may come with their own AC power adapter (best), while others will pull their power directly from the USB connection on the Mac. Some drives don't like to be connected to the computer through a dock or hub, working best or only when they are connected directly to the computer.

Your iMac has USB-C ports, so the optical drive you buy should preferably come with a USB-C cable or connector. However, most optical drives with even a USB-A plug can be adapted with a USB-A to USB-C plug adapter to work just fine.

I've had good luck with Asus and OWC brands of optical drives as well as the now discontinued Apple SuperDrive on many Macs olde and new.

As for ripping your owned DVDs to be stored on your hard drive, HandBrake works well.

D.I. Johnson wrote:

Your iMac has USB-C ports, so the optical drive you buy should preferably come with a USB-C cable or connector. However, most optical drives with even a USB-A plug can be adapted with a USB-A to USB-C plug adapter to work just fine.

In the case of the desktop CD/DVD and CD/DVD/Blu-Ray drives from OWC, those have USB 3.0 B sockets and detachable cables that go from USB 3.0 B to USB-A.

You can easily get replacement cables from other places, including USB 3.0 B to USB-C cables that cut out the need for a separate USB-A to USB-C adapter.

I recommend getting a drawer loading, self powered optical drive. One of the first seven of the drives on this OWC (MacSales.com) page would be an excellent choice: OWC Optical Drives, I have an older model of one of those for ripping audiobooks and extremely happy with it.

Any DVD player that you choose must be at least compatible with macOS Monterey and supports the DVD region code of the DVD you wish to play. Not all DVD player software supports all encryption formats, and fewer still support UltraHD Blu-ray discs.

Just to add, you will need third-party software to play Blu-ray DVDs.

VikingOSX wrote:

Any DVD player that you choose must be at least compatible with macOS Monterey and supports the DVD region code of the DVD you wish to play.

Ah yes, the "joys" of DRM! If you purchase a legitimate, non-bootleg, DVD-Video disc of a foreign film (or foreign release that's simply done better than the one the studios deign to sell in your region), then even if there isn't any problem with the video format (NTSC, PAL, etc.), you still might be intentionally locked out from playing it.

Your own set-top DVD player or DVD player application will have been programmed to do the dirty deed.

Change your DVD drive region in DVD Player on Mac - Apple Support

"WARNING: You can set the region code for your DVD drive only five times (including the original setting). The fifth time you change the code, it’s permanently set to the last code you set. Any DVDs you play must match the last code you set."

Blu-Ray also has region coding DRM, although I think the regions might not be as narrowly defined for Blu-Ray as they are for DVD-Video.

As Dialabrain has noted you will need to Blu-Ray app to play those discs. This is what I use:

https://www.macblurayplayer.com/macgo-mac-bluray-menu-player-pro.htm