What is it?
Withdrawing means taking supplied tokens back out of Aave. You can only withdraw what is still free in the pool, and only if your remaining collateral (if you have debt) still meets Aave's rules.
Why does it matter?
Large withdrawals reduce available liquidity. If many people withdraw the same asset at once, utilization can jump even when borrows did not change.
Example
The pool has 200M USDC available. A whale withdraws 50M USDC. Available cash falls. Other suppliers may find it harder to exit until borrows are repaid or new supply arrives.
Where can I find it?
Live Activity filter Withdraw. Asset pages show Available. Whales lists large withdrawals of $50k USD and above in the current window.