Its a website that connects traders with investors , suppose you don't want to trade manually but by copying other good forex traders , you connect your brokers account to zulutrade , select the traders you like (they have like 16.000+) based on their performance , history , ranking , etc and then whenever they trade all their trades are beeing executed automatically in your account. To better understand all this just go to their webiste and open a demo account(with virtual money). Hope i helped.