What is application memory on iMac?
What is application memory on my I-Mac
iMac 24″, macOS 26.1
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Application memory on a Mac is the amount of RAM (Random Access Memory) that is currently being used by your running applications to function. It's a temporary space that apps use to hold data while they are active, and it is cleared when you shut down the computer. You can view your Mac's application memory usage in the Activity Monitor app.
View memory usage in Activity Monitor on Mac - Apple Support