A constructed language, or conlang for short, is a language that has been created by a person or a group of people instead of having evolved naturally. There are many types of constructed languages, but they tend to fall into two categories - naturalistic and schematic. Naturalistic languages are more likely to be called planned languages because the word planning implies more of taking things from natural languages and combining and/or modifying them in some way. Schematic languages are those which, while they may share certain root words with other languages, are built from the ground up.