After logging into the app for the first time, the player creates their avatar. The player can choose the avatar's style, hair, skin, and eye color, and can choose from a limited number of outfits. After the avatar is created, it is displayed at the player's current location along with a map of the player's immediate surroundings. Features on the map may include a number of PokéStops and Pokémon gyms. These are typically located at identifiable landmarks, such as public art installations, historical markers, monuments or other points of interest.
As players travel the real world, the avatar moves along the game's map. Different Pokémon [there is quite a list] live in different areas of the world; for example, water-type Pokémon are generally found near water. When a player encounters a Pokémon, they may view it either in augmented reality mode or with a pre-rendered background. AR mode uses the camera and gyroscope on the player's mobile device to display an image of a Pokémon as though it were in the real world. Players can also take pictures, using an in-game camera, of the Pokémon that they encounter both with and without the AR mode activated.
Unlike other installments in the Pokémon series, players in Pokémon Go do not battle wild Pokémon to capture them. Rather, the game relies on a unique capture system where the player must throw a Poké Ball with the right force and at the right time to make a successful catch. After capturing a wild Pokémon, the player is awarded two types of in-game currencies: candies and stardust. The candies awarded by a successful catch depends on what evolutionary chain a Pokémon belongs to.
(2) - http://www.rollingstone.com/politics/news/can-new-york-be-saved-in-the-era-of-global-warming-20160705?page=3