How to update my iMac desktop to 10.6.6?

I want to download music onto my iphone but it says I need the newest version of itunes which I tried to download but then it says I need to update my mac to 10.6.6 and when I googled that there was no 10.6.6. Does anyone know how I can download it?

First off, you should look more closely at the screen for iTunes download to see…

"Macintosh System Requirements

Mac computer with an Intel Core processor
OS X version 10.6.8 or later
400MB of available disk space
Broadband Internet connection to use the iTunes Store"

Next, tell which iMac you have. To find out, go to the top menu bar, Apple logo > About This Mac > More Info. Then WRITE DOWN what you see (Your memory might not be great, based on the "10.6.6" detail you gave.) Please tell me which iMac you own, and then I can tell you what your options are.

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