Humans can literally look at invented squiggles on a screen, hear the sound each squiggle represents, combine those sounds in their heads to form a story, analyse the stories to understand their meanings, and then feel some form of emotional response all so we could shitpost on Reddit.

Human languages are just a bunch of made up sounds, represented by squiggly lines. They grew in time to be the universal way in which our species communicate, to the point where we can send those squiggles throughout the world to communicate globally. Different Languages represent different squiggles and sounds that we haven't learnt about.