Bitcoin is Money: Because if I give you 10M sats for the shoes you are wearing, you will do the trade

Bitcoin is a monetary Network: Because it can transfer value to anywhere in the world at the speed of light and almost no cost

Bitcoin is Financial Inclusion: Because anyone with a phone and access to internet can join the network and nobody can stop it

Bitcoin is Digital Energy: Because it can transform the sun in the desert, the wind in the ocean or the methan of a landfield into value that can be exchange for goods and services anywhere in the world.

Bitcoin is something else: Because I didn't discover that feature yet

And the most important:

Bitcoin is unknown: Because nobody can predict how this is going to evolve and what new features is going to have.