Hey guys, new to Uniswap here. https://app.uniswap.org/#/swap I found ...
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Hey guys, new to Uniswap here. https://app.uniswap.org/#/swap
I found when you send ETH it only show Swap. but when sending a token it shows this. What does "Approve" button do. (Why a button like this is needed in the first place?)