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Hidden files on usb start with "._"

Hi all. On several occasions i've had files copied onto my usb drive that im unsure of. Hidden, each begins with "._" the rest of the name will be the same as a legit file on the drive. Norton has flagged these files on 1 occasion. Also each file is 1024kb in length. Im not the most mac knowledgeable​ person so forgive me if its something​ rather trivial.