Duden

Duden is a comprehensive reference book and online resource that provides authoritative guidance on the German language. It includes correct spelling, grammar, usage, and definitions of words, serving as the standard authority for writers, educators, and language enthusiasts. First published in 1880, it helps ensure consistency and accuracy in German writing and communication. Think of it as the go-to dictionary and style guide for the German language, much like the Oxford English Dictionary for English speakers.