simple past tense and past participle of tag
"I tagged the stray dog with a collar so neighbors could identify it if they saw him again."
In plain English: To tag someone means to physically touch them so they know it is their turn to chase or run away.
"The security guard tagged all the packages with special stickers to track their movement."
Having a tag; labeled.
"The package arrived tagged with my name on the side."
In plain English: Tagged means marked with a label or identifier to show who owns something or where it came from.
"The tagged photos on social media showed everyone at the party."
Derived from the verb tag, which comes from Middle Low German takken meaning to mark or notch. The past participle originally referred to marking an animal with a physical token before being used more broadly for any labeling action.