A spectator chooses a card.  It’s placed back in the deck and the deck shuffled.  The magician shows a card, but it’s not the chosen one, so it’s placed on the table.  A magic gesture and without any cover it changes to the spectator’s chosen card.

You can also view this trick on YouTube at https://youtu.be/w87a9dKhaL4

You can see all the previous magic lessons here.