What is a “deposit”?

Copies of your photo to be held by the Copyright Office.

“…the owner of copyright or of the exclusive right of publication in a work published in the United States shall deposit, within three months after the date of such publication … two complete copies of the best edition … The required copies … shall be deposited in the Copyright Office…’
— U.S.C. Title 17 §407(a)

Publication is defined as the “distribution of copies … of a work to the public by sale or other transfer of ownership or by rental, lease, or lending.”

See copyright registration deposit.