"Sie" is a German pronoun that translates to "you" in English. It is used in formal contexts to address someone respectfully, such as in business or when speaking to strangers. The pronoun can also refer to "they" when used in a different context, indicating a group of people. In addition to its formal use, "Sie" is part of the German language's system of addressing individuals. This system includes other pronouns like "du," which is informal and used among friends or family. Understanding the appropriate use of "Sie" is essential for effective communication in German culture.