Mac storage basics · Memory, swap and speed
Is storage the same as memory (RAM) on a Mac?
Short answer: No. RAM is temporary working memory cleared on restart; storage is the SSD that keeps files. When RAM runs short macOS uses storage for swap, so the two interact.
No. Memory (RAM) is the fast, temporary workspace apps use while they run; it's cleared when you restart. Storage (your SSD) is where files and apps are kept permanently.
They're linked: when RAM runs short, macOS uses storage for swap, so very low free space can make memory problems worse. But freeing storage doesn't add RAM, and quitting apps doesn't free storage.