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hey it is Julian and you are on the blocks and in this video Im going to show you how you can call function of other smart contracts in solidity smart contract interaction are necessary when you want to use a certain project and do some operation for example if you want to transfer an ac21 its going to involve a smart contract interaction so make sure to pay attention to this video so Im going to show you four things first Im going to show you what is the syntax if we want to call a function of another smart contract from a smart contract then Im going to show you how we can use the import keyword in case that the source code of the to smart contract are not in the same file which will be the case most of the time then Im going to talk of contract interfaces which is the minimum required information for a smart contract to interact with another one and finally Im gonna explain you how error propagation work when a smart contract calls another one so lets start with first item