Du is a common Germanic second-person personal pronoun that can be found in many of the modern Germanic languages.
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Scandinavian languages
In Swedish, du is nowadays used on both informal and formal occasions due to reform in the 1970s. This means one can address anyone including nobility and politicians with du. However, it is rarely used when addressing a member of the Swedish royal family.
Du is also used in Danish and Norwegian.
In Icelandic, the equivalent pronoun for the nominative second person singular is þú.
English
In English, though obsolete in most dialects, the historical and etymological equivalent pronoun is thou. You, which was originally used for the plural or as a polite singular, is used today for both numbers and regardless of social context.
German
In German, du is only used as an informal pronoun. It is only addressed to persons that one knows very well, like family members and close friends. It is also most commonly used among young people. In formal cases one uses Sie.