What is the difference between declaring an empty interface and a type alias in programming languages?

In Go, an empty interface (interface{}) is a type that can hold a value of any type, since all types implement the empty interface. It is used for storing data of unknown type.

A type alias (type Alias = OriginalType) is simply another name for an existing type, not creating a new type, but allowing for a more convenient or understandable name.

Main differences:

• Empty interface — a universal container for any values.
• Type alias — a synonym for an existing type, does not change behavior.

Example:

var x interface{} = 42 // x can be any type

type MyInt = int // MyInt is an alias for int
var y MyInt = 10