It's used to print the values of variables while running tests to help debug and see what's happening inside your contracts but since it's a development tool, it serves no purpose on mainnet. Also, the remember to remove the usage of calls that use forge-std when removing of the import of forge-std.
https://github.com/Cyfrin/2023-07-foundry-defi-stablecoin/blob/main/script/DeployDSC.s.sol#L5
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