Global Variable
Domain: Programming Fundamentals
🎯 Motivation
Some variables need to be accessible everywhere - configuration settings, game state.
📋 Concrete Example
MAX_HEALTH = 100 at the top of the file is global. Any function can read it. But modifying it from inside a function requires global keyword.
🔗 Analogy
A school notice board - anyone in any classroom can read it. But if you want to change it, you need special permission.