
texten
to text
Colloquial for writing and sending a short message (SMS) or a message via a messenger service such as WhatsApp.
Ich texte dir später, wann ich ankomme.
I'll text you later when I arrive.
to text / to write
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to text
Colloquial for writing and sending a short message (SMS) or a message via a messenger service such as WhatsApp.
Ich texte dir später, wann ich ankomme.
I'll text you later when I arrive.

to write copy
To compose, formulate, or write a text of any kind.
Der Marketing-Mitarbeiter muss heute noch die neue Werbebroschüre texten.
The marketing employee still has to write the copy for the new advertising brochure today.

to write lyrics
To write the words for a song, meaning the lyrics.
Sie komponiert die Melodien und ihr Partner textet die passenden Worte dazu.
She composes the melodies, and her partner writes the matching lyrics for them.
The verb 'texten' is derived directly from the noun 'der Text' (the text). This formation is common in German, especially for modern activities.
Er hat den ganzen Vormittag an diesem wichtigen Text gearbeitet.
He worked on this important text all morning.
You can easily recognize the meaning of 'texten' from context. In everyday life, with reference to a mobile phone, it almost always means sending a message. In a professional context, it is about writing professional texts, and in a musical context, about song lyrics.
Kannst du mir kurz texten, wenn du fertig bist?
Can you text me quickly when you're done?
In the meaning 'to send a message', 'texten' is very colloquial and is used mainly in spoken language and informal chats.
Text mir mal ein Foto von deinem neuen Auto!
Text me a photo of your new car!
When you say whom you are writing a message to, that person is usually in the dative. The most common form is 'jemandem texten' (to text someone).
Ich muss meiner Mutter noch schnell texten, dass ich später komme.
I still need to quickly text my mother that I'll be coming later.
to write
Schreiben is the neutral term for communicating through written messages and can also refer to letters or emails. Texten is colloquial and refers especially to sending short messages by phone or messenger. Both are possible for a messenger message, but texten sounds more casual.

Ich texte dir später kurz über WhatsApp.
I’ll text you on WhatsApp later.
Ich schreibe dir später eine kurze Nachricht über WhatsApp.
I’ll send you a short message on WhatsApp later.