system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is "information" as used in physics?

Hello, 

I have been watching a ton of Youtube videos trying to under exactly what is meant by "information" when used in physics. All the videos they discuss possible means, methods, conceptions of "how, why where" information is. 

But, I cannot wrap my head around what exactly information IS?
gpt
You ever play the game Guess Who? You get to ask a series of yes/no questions to identify one person among 24. On average, the best questions will eliminate half the available characters from 24, to 12, to 6, to 3, to 2, then finally 1. Meaning you should be able to win in 5 questions.

So we would say, then, that this system has 5 bits of information. Information is basically the number of yes/no questions you would need to completely specify all of its properties.