As it describes itself:
Slack is a platform for team communication: everything in one place, instantly searchable, available wherever you go.
At ReputationVIP, we recently had Skype dropped completely in favour of Slack. And as you might guess, it was a huge win!
So how does Slack work? Why is it so good? What is a channel? What are alternatives to Slack? If you want to convince with good arguments your boss to switch, below are the slides that convinced mine: