what product do I buy to see a dvd on my new imac

Apple makes an external optical drive, it only works with newer Macs that no longer have a bulit-in Super Drive.

If you need other optical drives that work with your year and model Mac, look at these.

Not all optical drives are Mac compatible.

Most Mac compatible drives you will only find to be purchased online.

Here are two on Amazon.com that are cheap and Mac compatible

http://www.amazon.com/LG-Electronics-Portable-External-GP40NB40/dp/B009DS6OFU/re f=sr_1_7?ie=UTF8&qid=1398883289&sr=8-7&keywords=Mac+compatible+external+LG+opti c al+drive

Here's another source for Mac compatible optical drives. These are better quality optical drives.

These are also tray loading drives.

Tray loading optical drives are more reliable, plus they are capable of playing those smaller mini sized discs.

https://eshop.macsales.com/shop/firewire/optical-drives/

An external DVD drive will only mount to your Mac and Mac desktop AFTER you insert a DVD disc.

Good Luck to You!

Apple's USB SuperDrive should work, but there are 3rd party external DVD drives that will also work.

Apple USB SuperDrive - Apple