Can I add a second display to my iMac?

I would like to add a second display screen to my Mac. I have a spare VGA monitor.
(It is very usefl to be able to read on one screen and work on the other)
Is it possible and how?

Many thanks
Shows just about how much I know abnout technollogy.
The moitor also has a HDMI input. However I don't know which output on the back of the iMac to plug it into I alsl presume i will need an adaptor like the VGA one?

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