Computers can send all of pixels of a picture, the wholeness of a song, every single practical moments recorded on a video. Computers does so using extremely fast communication in binary numbers.
For humans, the situation is quite different. Humans have extremely sophisticated brain, which is a computer that no artificial computer can outsmart today. It recognizes faces, remembers tricks that solve problems, and creates new things. It thinks, it is conscious, and it feels. However, the method of communicating information is quite limited, compared to what computers can do. All human brains can do is utter a speech, that is encoded in language which is limited by the vocabulary and the finite number of pronunciations human can produce. Unlike computers that can send every single bit of data that matters, humans cannot.
That is why we so value simile and metaphors. Metaphorical speech can bring about an image that can't otherwise be communicated through language. But it has its limitations because by using a metaphor, you don't convey your own mental image of the compared thing to the listener directly. Listener thinks of his own mental image that may or may not match the mental image you intended. However, metaphor is indeed a useful tool in communicating data for humans.
If we were able to connect our brains and convey our thoughts directly, our communications will be so much more fast and accurate and wholesome. However, evolution is not quick enough or didn't have enough time to evolve such a inter-brain communication. But it developed robust enough a tool, which is our language. Although it is limited by vocabulary (there are many words in Korean that doesn't exist in English, so it is hard for an English speaker to rapidly conceive an idea that a Korean word may describe), it can convey infinite number of ideas. Just that power enables humans this much advancement. The fact that you can describe and evoke mental images is amazingly fascinating.
Language is brain's way of communicating data, which is limiting but potent enough to bring about a civilization that we know of today. Study of language thus can reveal some great insights into human mind, because language is a simplistic representation of human mind's operating system.