OS upgrade IMac Retina 2014 OS X Yosemite 10.10.5
I have an iMac retina 2014 OS X Yosemite 10.10.5
want to upgrade it to a higher os, is that posible ?
A 2014 iMac Retina can be upgrade to macOS 11 Big Sur. See the following from Identify your iMac model - Apple Support
iMac (Retina 5K, 27-inch, Late 2014)
Model Identifier: iMac15,1
Part Number: MF886xx/A
Newest compatible operating system: macOS Big Sur
Be sure to have a backup (a good idea at all times, not just when upgrading) and see instructions in: How to download and install macOS - Apple Support