Homoiconicity

In computer programming, homoiconicity is a property of some programming languages, in which the primary representation of programs is also a data structure in a primitive type of the language itself, from the Greek words homo meaning the same and icon meaning representation. This makes metaprogramming easier than in a language without this property. To put that another way, homoiconicity is where a program's source code is written as a basic data structure that the programming language knows how to access. For example, imagine a programming language that is particularly good at list manipulation. Now, imagine what would happen if you required programs for that language to be written in the form of lists. The result would be that the program could access its own source code while running, and programmatically reprogram itself on the fly.