What's the deal with this Slack integration?

Water Cooler Trivia was first built for email. But we love that Slack is eating the world of email, so we’re making it easier to access trivia contests directly via Slack. This means a weekly post in a #channel when the contest is ready for your brain, then a post in that channel with the results. Participants can also opt-in for Slack DMs to replace email for receiving their contest and results each week.