Discord - Chat for Gamers is the official app that lets you communicate with other gamers that are playing the same games you are, quickly and easily. You can interact with other people by chat, and by voice messages as well.
You can use Discord directly from your browser, no matter what device you use. In fact, this is one of the app's strength: you can login with your user information, and continue a conversation you left on a different device.
You can create your own channels from Discord's interface, and invite your friends to join. Apart from that, you can obviously enter any public channel, as long as you have the invitation codes, which aren't hard to find, specially for the most popular games, such as Battlefield, Day Z, Minecraft, Modern Warfare, or Hearthstone.
Discord is a very useful application for video game fans. It lets you connect with other gamers easily and quickly, and manage every aspect of your account without hassle.