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A closure is a function inside another, that reference a variable in the outer function.

	function showClosure() {

		var name = "Victor";

		this.getNameWithClosure = function() {
			return name;
   		}
	}

	var closureExample = new showClosure();

	closureExample.getNameWithClosure();

The variable "name" isn't garbage collected because of the reference, that keep it within a closure. It is a free variable, that is a variable still alive after the function in which it is defined has completed.