Dock disappearing on Mac Why does the Dock disappear on my Mac? It pops back up when I put the cursor to the bottom of the screen but does not stay there permanently any longer.
You've probably enabled Dock hiding. You can toggle this by pressing ⌥⌘D.

Alternatively, you can toggle it through System Preferences or by right-clicking the spacer between the apps and the stacks then turning Hiding off: