How bittrex and other bitcoin trading websites send bitcoin to their one user to another instantly and without any fees?

How bittrex and other bitcoin trading websites send bitcoin to their one user to another instantly and without any fees?

When user-1 post an order of selling btc, user-2 comes and fulfill that order, we noticed that instantly user-2 receive btc in his/her wallet. My question is how is it possible to send btc instantly with out any charges.

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