German is considered an inflective language, because it uses just one suffix for words, and that suffix has many-many variants to express the required grammatical meaning (singular/plural, modality, subject/object, dative/accusative, genitive, etc.)

Agglutinative languages just jam everything after the word in small morphemes. (And some, just to be sure, has a few variants of each of those, to match vowel kinds and such.)

One of my favorites was "Vorlesungsverzeichnis" (lecture directory/course catalog).

Vorlesung = lecture

- Lesung = a reading (like a book reading)/lesson

- add "Vor" ("before" as in "in front of [a group]") and it becomes Lecture

Verzeichnis = directory

- Zeichnis = symbol, signal, reference, sign

- add "Ver" (hard to really explain what it does) and it becomes directory, index, register, list