What Is the Meaning of Architecture?

There's a study called semiotic. It tells us that language is composed of signs, signifier and signified. If you've had this education, you understand what this means in terms of architecture. So there's meaning that goes into the buildings we design,. above and beyond a roof, shelter, warmth, protection from the elements. These are the things that as architects, we can see. Why does architecture matter to humanity? What's the significance of a building?