An adverb is a part of speech that answers questions like: how? where? when? why? In German, it's called Adverb (singular) or Adverbien (plural). Adverbs add extra information to a sentence — they describe an action, time, place, reason, or manner. And they don’t decline or change like adjectives do. Convenient, right? For example, in the sentence “Er läuft schnell” ("He runs quickly"), the word schnell is an adverb—it tells how he runs. Or in “Wir treffen uns morgen” ("We’ll meet tomorrow"), the adverb morgen answers when. Unlike adjectives, which describe nouns, adverbs most often describe verbs, adjectives, or even other adverbs. Compare: “eine schöne Blume” (a beautiful flower — schöne is an adjective) and “Sie singt schön” (she sings beautifully — schön is an adverb). What’s cool is that German adverbs don’t agree with the subject, have no gender, number, or case—they’re like free agents: they enter the sentence and enrich it, while staying themselves. Almost philosophical. Also, note that some adverbs in German are basically frozen adjective forms. For example, laut can mean both “loud” and “loudly,” depending on context. It can be confusing, but in practice, the context clarifies it. And yes, there's another trick: German has many compound adverbs, like auf einmal (all of a sudden), inzwischen (meanwhile), immer noch (still). It’s better to learn those as fixed phrases. In short, adverbs are compact yet vital words that make German vibrant and expressive. Understanding them is a step toward confident grammar and eloquent spoken language.