Entity

An entity is a functional unit of all games basing on id software technology.

Examples for entities are:

• lights
• AI (guards, spiders)
• the player
• path nodes
• moveables
• readables
• models (or "static meshes" to be more precise)
• the world itself ("worldspawn")

An entity's functional behaviour is entirely defined through its spawnargs, a collection of key/value pairs.