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Slack is not a program/service, they stole the name in a pathetic attempt to entice SubGenii. When that failed, they set their sites on besmirching the good name of our most basic need by associating it with them. It’s a tool of The Conspiracy, nothing more.
What is Slack? Well, if you have to ask, you’ll probably never know. Put most simply, Slack is something for nothing.
Ironically, Slackware is SubGenius. It was created by a SubGenius in iirc '93, “Bob’s” face is seen in the belly of a Tux on the Slackware official site.