
taggen
to tag
On social media or digital platforms, to mark a person in a photo or post, or to label content with a keyword.
Ich habe dich auf dem Gruppenfoto von der Party getaggt.
I tagged you in the group photo from the party.
to tag
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to tag
On social media or digital platforms, to mark a person in a photo or post, or to label content with a keyword.
Ich habe dich auf dem Gruppenfoto von der Party getaggt.
I tagged you in the group photo from the party.

to tag
In the graffiti scene, to put one's name or abbreviation (a 'tag') on a surface with a pen or spray can.
Unbekannte haben die frisch gestrichene Wand mit ihren Zeichen getaggt.
Unknown people tagged the freshly painted wall with their signs.
'Taggen' (to tag) is a loanword from English ('to tag'). In German, it is conjugated like a regular weak verb: ich tagge, du taggst, er hat getaggt.
Er hat alle seine Freunde auf dem Bild getaggt.
He tagged all his friends in the picture.
The meaning depends heavily on the context. In connection with social media, photos, and posts, it means 'markieren' (to tag/mark). In the context of graffiti, walls, and pens, it means to leave one's name or sign behind.
Kannst du mich in dem Beitrag taggen, damit ich ihn auch sehe?
Can you tag me in the post so that I can see it too?
In the digital world, 'taggen' (to tag) often follows the pattern: 'jemanden (Akkusativ) auf etwas (Dativ) taggen' (to tag someone in/on something). The 'something' is usually a photo, a picture, or a post.
Sie wurde auf einem alten Urlaubsfoto getaggt.
She was tagged in an old vacation photo.
to mark / pretend
Markieren is the general term for marking or highlighting something. Taggen specifically refers to linking a person or adding a keyword on digital platforms. So in a photo, you can visibly mark a person or tag them through the platform.

Auf der Plattform taggt Lea ihren Bruder auf dem Gruppenfoto, damit sein Profil verknüpft wird.
On the platform, Lea is tagging her brother in the group photo so that his profile is linked.
Im Bildprogramm markiert Lea ihren Bruder auf dem Gruppenfoto mit einem roten Kreis.
In the image-editing program, Lea is marking her brother in the group photo with a red circle.