IO.gets

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

gets(device \\ :stdio, prompt)

gets(device(), chardata() | String.Chars.t()) :: chardata() | nodata()

Reads a line from the IO device.

It returns:

data - the characters in the line terminated by a line-feed (LF) or end of file (EOF)
:eof - end of file was encountered
{:error, reason} - other (rare) error condition; for instance, {:error, :estale} if reading from an NFS volume

To display "What is your name?" as a prompt and await user input:

IO.gets("What is your name?\n")