It is a way to build a new string value where the code is wrapped in curly braces and ‘#’ function.

BY Best Interview Question ON 13 Jan 2019
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Example

                                        
x = "Apocalypse"

y = "X-men #{x}"

IO.puts(y)

x = "Apocalypse"

y = "X-men #{x}"

IO.puts(y)

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