Discarding all your cards in hand for each round is the secondary objective (but important as well, as we shall see).
But unlike Uno, getting rid of your cards is not your main goal the goal is to construct and complete your Phases (also called melds), from Phase 1 all the way to Phase 10. Phase 10 is a bit like Uno, in that you are always trying to get rid of all the cards in your hand and be the first to do it for all hands. It was originally created in 1982 by a man named Kenneth R Johnson, and marketed by a company called Fundex, who sold their rights to Mattel in 2010. The first player to complete all 10 Phases wins the game. This card game resembles Rummy, but the main difference is that you have to complete 10 different types of match-ups or Phases, in order to win the game. Phase 10 is another popular card game by Mattel, the makers of Uno.
