The Shop is the Clash of the Dragons Store. There one can purchase Booster Packs and special services, including Energy refills and the purchasing of Gold or Skill Points. One can also purchase class-specific Equipment.
Some items can be purchased with Gold, while others require Dragon Coins. One can see how much of each currency you possess on the Navigation Bar at the bottom of the screen.
Once purchased, some items (such as booster packs) will need to be opened before accessing the cards they contain. To open packs and decks, one must double click on them in the shop or in the pack opener in the deck editor section of the game.