In this video i will talk about Immediately invoked function in JavaScript. Functions are one of the building blocks of any programming language and JavaScript has taken the Functions to a whole new level. Functions are said to be a collection of statements to be executed in a proper sequence in a particular context. Now JavaScript provides a variety of methods to define and execute Functions, there are named functions, anonymous functions and then there are Functions that are executed as soon as they are mounted, these functions are known as Immediately Invoked Function Expressions or IIFEs.