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A big free space. Ask for memory, use it, give it back.
Not a pile — a warehouse. You request a spot, you get a key. Forget to return the key, the space is lost forever.
malloc ──> [ . . . . ] got a slot
│
▼
use it
│
▼
free ──> [ ] returned
An address. Tells you where a value lives, not the value itself.
Think of it as a house number. The number isn’t the house — it just tells you where to find it.
x ──> [ 42 ]
0x1a2b
x holds the address.
0x1a2b is where 42 actually lives.
A pile. Last one on is the first one off.
Like stacking plates. You can’t grab the bottom plate without lifting the ones above it.
push ──> ┌───┐
│ C │ <- top
├───┤
│ B │
├───┤
│ A │ <- bottom
└───┘
<-- pop takes C first
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