You can convey the same message without it.
"Where are you" opposed to "Where are you at?"
Do you know it's grammatically correct? I see this all the time with publications and signs.
In ESL, I learned not to do this. I also learned the preposition modifies the verb, not the object/noun.
"Put the apple down" would be considered incorrect, right?
It should be, "Put down the apple."
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