IO.write

You're seeing just the function write, go back to IO module for more information.
Link to this function

write(device \\ :stdio, chardata)

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Specs

write(device(), chardata() | String.Chars.t()) :: :ok

Writes chardata to the given device.

By default, the device is the standard output.

Examples

IO.write("sample")
#=> sample

IO.write(:stderr, "error")
#=> error