Why does German have "Sie" and "du" for "you"?

In German, you use the intimate du for family, pets, and God. But to politely say "you" to a stranger (Sie), you must address them as an esteemed group of people not even in the room.

This division, known to linguists as the T-V distinction, acts as a built-in social radar. It forces speakers to constantly measure the relationship between intimacy and distance. While du signals closeness, Sie creates a professional or respectful boundary when speaking to clients and authority figures. Getting it wrong risks insulting a boss or sounding comically stuffy to a child.

The existence of these two pronouns is the result of centuries of linguistic inflation. In Old High German, things were simple: du was singular and ihr was plural. During the Middle Ages, influenced by the "royal we" of Latin-speaking emperors, Germans began addressing nobility with the plural ihr to multiply their status.

By the 17th century, European society had grown so rigidly stratified that ihr no longer felt respectful enough for the true elite. Speakers shifted to the third-person singular, addressing superiors as Er (he) or Sie (she)—essentially speaking to them as if they were being discussed rather than addressed directly ("Would the gentleman care to sit?").

Peak deference eventually required the third-person plural. To show absolute respect, you addressed the person as an absent collective. Literally translated, the formal greeting became: "How are they doing?" This third-person plural pronoun, capitalized as Sie, cemented itself as the permanent standard for polite address in the 18th century.

Moving from Sie to du remains a significant social milestone today. The transition is governed by strict etiquette: the older or higher-status person must be the one to offer the du, sometimes finalized with a ritual toast known as "Bruderschaft trinken" (drinking brotherhood). While modern startup culture and international companies are increasingly adopting a universal "coworker-du," traditional German boardrooms and government offices still enforce the formal Sie, keeping a linguistic arm's length between colleagues for their entire careers.

The 1788 title page of Adolph Freiherr von Knigge's 'Über den Umgang mit Menschen' (On Human Relations), a text that heavily influenced the strict rules of German social etiquette and personal boundaries. Source: Wikimedia Commons.