What is IIFE ?

What is IIFE (IFFY) used in Javascript world ? and why is this concept so important ?

Default Asked on October 24, 2016 in Javascript.
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    This is “Immediately Executed Function Expression”.  Also known as self executed anonymous function.

    Basically, this type of expressions are being used to avoid creating global variables, which will allow public access to them. One of the best practices used by developers today.

     (function() {
     var str = 'Hello world';
    Train Answered on October 24, 2016.
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