adverb
online, on the internet
A2
online: adverb/adj. meaning 'on the internet' or 'connected'. Common uses: online (connected), on the internet (service or activity). In German it's often used indeclinably as adverb; as adjective used predicatively or attributively, sometimes treated as uninflected in colloquial usage. No declension, no auxiliary verbs.
Examples
Das Formular ist online verfügbar.
The form is available on the internet.
Ich kaufe oft online ein.
I often shop online.
Die Studenten lernten online, als die Bibliotheken wegen Renovierung geschlossen wurden.
The students studied online when the libraries were closed for renovation.
Details
Mnemonics
Picture a computer with a green 'online' light
Same as English 'online'
Notes
Used widely in German as an adverb/adjective; unchanged form.