Gas
The unit Ethereum uses to measure the computation and other resources a transaction consumes.
In more detail
Gas measures work; ETH pays the bill. Sending ETH usually needs less work than a swap that calls several contracts, so those transactions can cost different amounts at the same gas price. An included transaction that fails can still consume gas: the network did the work even though its changes reverted.
How you might use it
Your swap reverts because the price moved, but the wallet still shows a network fee for the attempted transaction.

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