Ferdinand de Saussure was a Swiss linguist and semiotician born in 1857 in Geneva. He gave lectures developing important principles of language description, arguing that words are collective social products essential for constituting our world, not just labels superimposed on pre-existing things. Saussure viewed language as central rather than peripheral to our understanding of reality, and his work profoundly influenced developments across the human sciences by establishing language as key to comprehending our world.