system
Given the following post, respond as if you're commenting on Reddit:
human
What exactly is "Information"?

In many other posts they say that information can not travel faster than the speed of light, but what exactly is information and what can be considered not information.
gpt
At its most fundamental, information is any propagation of cause and effect within a system. The degree to which the the past state of one part of the system can be known through observation at another part of the system. Effect can only propagate at the speed of light (since nothing can go faster).

Information is carried in a "signal", which is the variation of any physical property, over time, against the backdrop of random variation (entropy). 

Different fields discuss information in different contexts. E.g. in physics you'll probably be talking about the propagation of cause and effect. In information theory, you're probably talking about formal logic, statistics, signalling, bandwidth, [edit: also, should include language, coding, compression, cryptography, etc.] etc.