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today were going to continue our exploration of the erc20 interface by focusing on how tokens are transferred in addition ill look at some scams and risks that many people are not aware of when transferring tokens using an erc20 contract we typically use four methods transfer allowance approve and transfer from the simplest method of transferring is a simple direct transfer in this case if alice wants to transfer 10 tokens to bob then alice can directly call the transfer method on the erc20 contract which will decrement alices balance by 10 and increment bobs balance by 10. the second approach using a proven transfer from is slightly more complicated its typically used when you have a third party which is granted permission to transfer tokens on behalf of a user lets look at an example lets say alice wants to sell some of her tokens through uniswap in that case alice can grant unispot permission to transfer tokens on alices behalf later on when bob wishes to buy alices tokens
