empty interface in Go

The interface type that specifies zero methods is known as the empty interface.
In most object-oriented languages, a built-in base class, often named object, is the superclass for all other classes. Go, having no inheritance, doesn’t have such a superclass. What it does have is an empty interface with no methods: interface{}. Since every type implements all 0 of the empty interface’s methods, and since interfaces are implicitly implemented, every type fulfills the contract of the empty interface
```
package main

import "fmt"

func main() {
	var i interface{}
	describe(i)

	i = 42
	describe(i)

	i = "hello"
	describe(i)
}

func describe(i interface{}) {
	fmt.Printf("(%v, %T)\n", i, i)
}
```
To convert an interface variable to an explicit type, you use.(TYPE)
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