Language has been our primary mean of communication and human interaction for thousands of years. For a community, the language contained the words that the people need to communicate, words themselves are abstract, but they indicate the meaning, they point to objects or actions, etc..
When you look at your computer, you’ll find it’s not so much different. There are many pieces of hardware and software that need to communicate with each other. Your application is reacting to the mouse and keyboard or even the mic, it can read files from your disk storage and so on. But at the end of the day, the machine understands nothing but bits, 1s, and 0s, the combination of which creates meaning.